Abstract:
An agricultural machine or implement has a main frame section and at least one wing section, each having lift cylinders. A main shank frame may be pivotally attached to the main frame section and may have hydraulically adjustable gauge wheels. Wing shank frames may be pivotally attached to the wing sections and may also have hydraulically adjustable gauge wheels. Bypass circuits may be used to individually adjust the lift cylinders and gauge wheel cylinders. A controller or controllers is used to purge air from the lift cylinders, gauge wheel cylinders, cylinders used to raise the shank frames for transport, and from the bypass circuits. The purge routine may be selectable as individual steps, hydraulic subsystem purges, or as one automatic purge routine.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is a continuation-in-part application based upon U.S. Non-Provisional patent application Ser. No. 15/087,057, entitled, “TILLAGE ELECTRO HYDRAULIC DESIGN AND LAYOUT ON FOLD SEQUENCE ON FRONT FOLD MACHINE”, filed Mar. 31, 2016, which is a continuation-in-part based on U.S. Non-Provisional patent application Ser. No. 14/528,345, entitled “FOLDING SEQUENCE OF ENTIRE AGRICULTURAL TILLAGE IMPLEMENT”, filed Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,502, entitled “TILLAGE IMPLEMENT WITH FOLDABLE SHANK FRAME”, filed Dec. 11, 2013 which is incorporated herein by reference; U.S. Non-Provisional patent application Ser. No. 14/528,356, entitled “FRONT FOLDING ARRANGEMENT FOR AGRICULTURAL TILLAGE IMPLEMENT”, filed Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,502, entitled “TILLAGE IMPLEMENT WITH FOLDABLE SHANK FRAME”, filed Dec. 11, 2013 which is incorporated herein by reference; U.S. Non-Provisional patent application Ser. No. 14/528,236, entitled “DRAFT LINKAGE CONFIGURATION”, filed on Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,594, entitled “TURNBUCKLE ADJUSTMENT FOR TILLAGE IMPLEMENT TRACKING”, filed on Dec. 11, 2013 which is incorporated herein by reference; and U.S. Non-Provisional patent application Ser. No. 14/528,535, entitled “DRAFT TUBE SEQUENCING FOR AN AGRICULTURAL TILLAGE IMPLEMENT”, filed on Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,594, entitled “TURNBUCKLE ADJUSTMENT FOR TILLAGE IMPLEMENT TRACKING”, filed Dec. 11, 2013 which is incorporated herein by reference. 
         [0002]    This is also a continuation-in-part based upon U.S. Non-Provisional patent application Ser. No. 15/086,797, entitled, “TILLAGE ELECTRO HYDRAULIC DESIGN AND LAYOUT ON RAISE AND LOWER SYSTEM ON FRONT FOLD MACHINE”, filed Mar. 31, 2016, which is a continuation-in-part application based upon U.S. Non-Provisional patent application Ser. No. 14/528,345, entitled “FOLDING SEQUENCE OF ENTIRE AGRICULTURAL TILLAGE IMPLEMENT”, filed Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,502, entitled “TILLAGE IMPLEMENT WITH FOLDABLE SHANK FRAME”, filed Dec. 11, 2013 which is incorporated herein by reference; U.S. Non-Provisional patent application Ser. No. 14/528,356, entitled “FRONT FOLDING ARRANGEMENT FOR AGRICULTURAL TILLAGE IMPLEMENT”, filed Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,502, entitled “TILLAGE IMPLEMENT WITH FOLDABLE SHANK FRAME”, filed Dec. 11, 2013 which is incorporated herein by reference; U.S. Non-Provisional patent application Ser. No. 14/528,236, entitled “DRAFT LINKAGE CONFIGURATION”, filed on Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,594, entitled “TURNBUCKLE ADJUSTMENT FOR TILLAGE IMPLEMENT TRACKING”, filed on Dec. 11, 2013 which is incorporated herein by reference; U.S. Non-Provisional patent application Ser. No. 14/528,535, entitled “DRAFT TUBE SEQUENCING FOR AN AGRICULTURAL TILLAGE IMPLEMENT”, filed on Oct. 30, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,594, entitled “TURNBUCKLE ADJUSTMENT FOR TILLAGE IMPLEMENT TRACKING”, filed Dec. 11, 2013 which is incorporated herein by reference; and U.S. patent application Ser. No. 14/558,498, entitled “REMOTE LEVELING OF TILLAGE IMPLEMENTS USING THREE WAY VALVES”, filed on Dec. 2, 2014, which is a non-provisional of U.S. Provisional Application Ser. No. 61/914,686, entitled “REMOTE LEVELING OF TILLAGE IMPLEMENTS USING THREE WAY VALVES, filed on Dec. 11, 2013 which is incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0003]    1. Field of the Invention 
         [0004]    The present invention relates to agricultural tillage implements or machines, and, more particularly, to hydraulic control systems of agricultural field cultivators. 
         [0005]    2. Description of the Related Art 
         [0006]    Farmers utilize a wide variety of agricultural implements or machines to prepare soil for planting, for the task of planting itself, for harvesting, and for other miscellaneous agricultural functions. Some such agricultural implements or machines may include two or more sections coupled together to perform multiple functions as they are pulled through fields by a tractor. For example, a field cultivator is capable of simultaneously tilling soil and leveling the tilled soil in preparation for planting. A field cultivator has a frame that carries a number of cultivator shanks with shovels at their lower ends for tilling the soil. The field cultivator converts compacted soil into a level seedbed with a consistent depth for providing excellent conditions for planting of a crop. Grass or residual crop material disposed on top of the soil is also worked into the seedbed so that it does not interfere with a seeding implement or machine subsequently passing through the seedbed. A field cultivator as described above may also include optional rear auxiliary implements for finishing the seedbed for seeding. For example, such rear auxiliary implements may include spike tooth harrows, spring tooth harrows, rolling (aka. crumbler) baskets, drag tines, etc., or any combination thereof. 
         [0007]    As illustrated by the example of a field cultivator, agricultural tillage implements or machines have become increasingly multi-functional, complex, and physically larger machines. As a result, the hydraulic systems that are used to operate them, as well as to fold and unfold them for road transport, have also become increasingly complex. Often, these system include dozens of hydraulic cylinders, motors, valves, flow dividers, and other hydraulic devices. In order to function properly, such hydraulic systems must have any and all entrained air removed from them in a process commonly referred to as bleeding. Traditionally, this has involved simply opening or cycling valves in a certain order to allow the air to escape. However, with the increasingly complicated hydraulic systems used in agricultural implements or machines, often the traditional method of manually opening or cycling valves has become overly burdensome, time consuming, confusing, and unreliable. The problem of effectively bleeding air from the hydraulic systems of these agricultural implements or machines is further exacerbated by the fact that certain hydraulic circuits are not routinely used by the operated, such as bypasses and relief circuits. 
         [0008]    What is needed in the art, therefore is a way to effectively, quickly, and efficiently bleed the hydraulic systems of agricultural implements or machines. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention provides a system and method for purging air from a hydraulic system for an agricultural machine or implement with multiple hydraulically actuated functions. 
         [0010]    As a non-limiting example, an agricultural tillage implement is illustrated having a main section and wing sections that may be foldable to a compact transport configuration using main fold hydraulic cylinders. The main section and wing sections may be raised and lowered on hydraulically actuated lift wheels. A main shank frame may be foldable up and over a main frame section when in the transport configuration using at least one main shank frame hydraulic cylinder, and may be foldable down and forward of the main frame section when in the operating configuration using the at least one main shank frame hydraulic cylinder. Wing front shank frames may fold upwards against each wing section when in the transport configuration using wing front shank frame hydraulic cylinders, and may fold down and forward of the wing sections when in the operating configuration using the wing front shank frame hydraulic cylinders. Wing section rear auxiliary implements may also fold upward against each wing section when in the transport configuration using wing section rear auxiliary implement hydraulic cylinders, and may fold down and rearward of the wing sections when in the operating configuration using the wing section rear auxiliary implement hydraulic cylinders. The main shank frame and the wing front shank frames may have gauge wheels that are hydraulically raised and lowered in order to control the depth of tools attached thereto. The front of the main section may be raised and lowered using a pull hitch hydraulic cylinder. The agricultural tillage implement may further include a hitch lock that unlocks when transitioning from the operating configuration to the transport configuration, and vice versa, using a hitch lock hydraulic cylinder. The agricultural tillage implement may further include draft linkage assemblies with pivoting swing arms that pivot inwards when in the transport configuration, and that pivot outwards when in the operating configuration, using pivoting swing arm hydraulic cylinders. 
         [0011]    This non-limiting example of the agricultural tillage implement is illustrated with multiple valves, hydraulic circuits, and bypasses, in several alternative arrangements, to demonstrate the inventive technique of purging air from a complex agricultural machine or implement, utilizing the valves, hydraulic circuits, and bypasses that are otherwise used to operate and adjust the machine or implement. One or more controllers configured with controlling software allow an operator to select certain air purge routines, subroutines, or individual purge routine steps. This may be accomplished using buttons on an in-cab screen that steps the operator through the bleed sequence. When the operator presses the appropriate button, the implement controller or controllers cause the hydraulic valves to turn on and off in the most effective and efficient sequence. This prevents the operator from selecting the wrong valves during the bleeding process, and ensures a consistent bleed sequence every time the system or method is used. The selectable routines, subroutines, or individual steps may be arranged step by step, as groupings of steps by hydraulic subsystem, or by way of a single automated purge routine using one “purge” button. 
         [0012]    The invention in one form is directed to an agricultural machine or implement. The agricultural machine or implement has a main frame section and at least one wing section. At least one first hydraulic subsystem includes at least one main frame lift hydraulic cylinder for raising and lowering the main frame section, at least one wing section lift hydraulic cylinder for raising and lowering the wing sections, and at least one first bypass circuit bypassing at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. At least one controller is operably connected to valves controlling hydraulic pressure and flow to at least one of the main frame lift hydraulic cylinders, the wing section lift hydraulic cylinders, and the at least one first bypass circuit. The controller or controllers are configured to bleed air from the at least one first hydraulic subsystem using several steps. The first step is extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. The second step is retracting the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. The third step is bypassing at least one of the main frame lift hydraulic cylinders and/or wing section lift hydraulic cylinders while extending at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. The fourth step is again extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. 
         [0013]    The invention in another form is directed to a hydraulic system of an agricultural machine or implement having a main frame section, at least one wing section, at least one main structure pivotally connected to the main frame section, and at least one wing structure pivotally connected to the at least one wing section. The hydraulic system includes at least one first hydraulic subsystem including at least one main frame lift hydraulic cylinder for raising and lowering the main frame section, at least one wing section lift hydraulic cylinder for raising and lowering the at least one wing section, and at least one first bypass circuit bypassing at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. At least one controller is operably connected to valves controlling hydraulic pressure and flow to at least one of the main frame lift hydraulic cylinders, the wing section lift hydraulic cylinders, and the at least one first bypass circuit. The controller or controllers are configured to bleed air from the at least one first hydraulic subsystem using several steps. The first step is extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. The second step is retracting the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. The third step is bypassing at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders while extending at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. The fourth step is extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders. 
         [0014]    The invention in yet another form is directed to a method of bleeding air from a hydraulic system of an agricultural machine or implement having a main frame section, at least one wing section, at least one main structure pivotally connected to the main frame section, and at least one wing structure pivotally connected to the at least one wing section. The method includes several steps. The first step is providing at least one first hydraulic subsystem including at least one main frame lift hydraulic cylinder for raising and lowering the main frame section, at least one wing section lift hydraulic cylinder for raising and lowering the at least one wing section, and at least one first bypass circuit bypassing at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. The second step is providing each of the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders with at least one re-phasing port. The third step is operably connecting at least one controller to at least one valve controlling hydraulic pressure and flow to at least one of the main frame lift hydraulic cylinders, the wing section lift hydraulic cylinders, and the at least one first bypass circuit. The fourth step is configuring the controller or controllers to bleed air from the at least one first hydraulic subsystem using several sub-steps. The first sub-step is extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders until each re-phasing port of each main frame lift hydraulic cylinder and of each wing section lift hydraulic cylinder releases hydraulic pressure. The second sub-step is retracting the main frame lift hydraulic cylinders and wing section lift hydraulic cylinders. The third sub-step is bypassing at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders while extending at least one of the main frame lift hydraulic cylinders and/or the wing section lift hydraulic cylinders. The fourth sub-step is again extending the main frame lift hydraulic cylinders and the wing section lift hydraulic cylinders until each re-phasing port of each main frame lift hydraulic cylinder and of each wing section lift hydraulic cylinder releases hydraulic pressure. 
         [0015]    An advantage of the present invention is that it allows an operator to quickly, effectively, and efficiently purge air from an agricultural machine or implement. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]    The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein: 
           [0017]      FIG. 1  is a top perspective view of an embodiment of an agricultural tillage implement within which an embodiment of the present invention may be utilized, in the form of a field cultivator; 
           [0018]      FIG. 2  is a top perspective view of the agricultural tillage implement shown in  FIG. 1 , with the main shank frame folded to a transport configuration and the wing front shank frames and wing section rear auxiliary implements folded upwards to a transport configuration; 
           [0019]      FIG. 3  is a top perspective view of the agricultural tillage implement shown in  FIGS. 1-2 , with the wing sections folded forward about at least one generally vertical axis to a transport configuration; 
           [0020]      FIG. 4  is a side view of the agricultural tillage implement shown in  FIGS. 1-3 , with the main shank frame shown in the transport position, the main frame lowered, the main rear auxiliary implement lowered, and the wing front shank frames and wing section rear auxiliary implements in their generally horizontal positions; 
           [0021]      FIG. 5  is a side view of the agricultural tillage implement shown in  FIGS. 1-4 , with the main shank frame in the transport position, the main frame lifted, the main rear auxiliary implement raised, and the wing section rear auxiliary implements in their generally vertical positions; 
           [0022]      FIG. 6  is a partial top view of the agricultural tillage implement showing additional detail of a draft linkage assembly; 
           [0023]      FIG. 7  is a schematic illustration of a tillage implement hydraulic system according to an embodiment of the present invention; 
           [0024]      FIG. 8  is a schematic illustration of a tillage implement hydraulic system according to an embodiment of the present invention; 
           [0025]      FIG. 9  is a schematic illustration of a tillage implement hydraulic system according to another embodiment of the present invention; 
           [0026]      FIG. 10  is a schematic illustration of a tillage implement hydraulic system according to another embodiment of the present invention; 
           [0027]      FIG. 11  is a schematic illustration of a tillage implement hydraulic system according to another embodiment of the present invention; 
           [0028]      FIG. 12  is a schematic illustration of a tillage implement hydraulic system according to another embodiment of the present invention; 
           [0029]      FIG. 13  is a schematic illustration of a tillage implement hydraulic system according to another embodiment of the present invention; and 
           [0030]      FIG. 14  is a flow chart showing a series of steps taken in the functioning of an embodiment of the present invention. 
       
    
    
       [0031]    Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrates embodiment of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner. 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0032]    Referring now to the drawings, and more particularly to  FIGS. 1 through 6 , there is shown an exemplary embodiment of an agricultural tillage implement upon which an embodiment the present invention may be utilized. In the illustrated embodiment, the agricultural tillage implement  10  is in the form of a field cultivator for tilling and finishing soil prior to seeding. 
         [0033]    Agricultural tillage implement  10  is configured as a multi-section field cultivator, and includes a main frame section  12  and a plurality of wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B. The left wings sections are designated  14 A,  16 A and  18 A, and the right wing sections are designated  14 B,  16 B and  18 B. Wing sections  14 A and  14 B are each inner wing sections, wing sections  16 A and  16 B are each middle wing sections, and wing sections  18 A and  18 B are each outer wing sections. Intermediate wings  13 A and  13 B may be attached to main frame section  12 , and may provide generally vertical axes  86  and  88  about which the plurality of wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B pivot. 
         [0034]    Main frame section  12  is the center section that is directly towed by a traction unit, such as an agricultural tractor (not shown). Main frame section  12  includes a pull hitch tube  20  extending in a travel direction  22 , and a tool bar  24  which is coupled with and extends transverse to pull hitch tube  20 . Main frame section  12  generally functions to carry a main shank frame  28  for tilling the soil, and a main rear auxiliary implement  30  for finishing the soil. Main shank frame  28  generally functions to carry cultivator shanks  36  for tilling the soil. Main shank frame  28  is pivotally coupled with tool bar  24 , so that main shank frame  28  is positioned in front of the tool bar  24  when in an operating configuration ( FIG. 1 ), and is foldable up and over the tool bar  24  when in a transport configuration ( FIGS. 2-5 ). The main frame section  12  may be raised and lowered using rear lift wheels  52  using hydraulic cylinder  54  and using hydraulic cylinder  55  connected to pull hitch  124 . Main shank frame  28  also includes one or more gauge wheel assemblies  56  which function to level main shank frames  28 . A hydraulic cylinder  58  is used to fold main shank frame  28  from the operating configuration to the transport configuration, and vice versa. Hydraulic cylinder  58  may optionally be placed in a “float mode” such that gauge wheel assemblies  56  are operable to float up and down as they traverse across a field and thereby cooperate with hydraulic cylinders  62  actuating gauge wheel assemblies  56  to set the operating depth at the front edge of main shank frame  28 . 
         [0035]    Similarly, wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B are provided with left inner wing front shank frame  66 A, right inner wing front shank frame  66 B, left middle wing front shank frame  66 C, right middle wing front shank frame  66 D, left outer wing front shank frame  66 E, and right outer wing front shank frame  66 F, respectively, which each function to carry cultivator shanks  36  for tilling the soil. Each of the left inner wing front shank frame  66 A, right inner wing front shank frame  66 B, left middle wing front shank frame  66 C, right middle wing front shank frame  66 D, left outer wing front shank frame  66 E, and right outer wing front shank frame  66 F is provided with at least one gauge wheel assembly  70  which function to level the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F using hydraulic cylinders  64 , and to control the depth of the cultivator shanks. Hydraulic cylinders  68 , which serve to fold the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F upwards as will be described, may optionally be placed in a “float mode” such that the gauge wheel assemblies  70  are operable to float up and down as they traverse across a field and thereby cooperate with hydraulic cylinders  64  actuating gauge wheel assemblies  70  to set the operating depth at the front edges of wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F. 
         [0036]    Left and right wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B may be braced by a draft linkage assembly  200  including diagonally angled draft tubes  72 . Main fold hydraulic cylinders  116 A and  116 B are shown in a rear mounted configuration, so that for example right main fold hydraulic cylinder  116 B acts on intermediate wing  13 B of wing sections  14 B,  16 B, and  18 B directly. It may be that main fold hydraulic cylinder is instead be mounted longitudinally on telescoping pull hitch tube  20 , causing extending telescoping pull hitch tube  20  to pull wing sections  14 B,  16 B, and  18 B into the transport configuration by action of the diagonally angled draft tubes  72  when the wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B are folded forward. 
         [0037]    During use, it is periodically necessary to move the agricultural tillage implement  10  from an unfolded (operating) configuration to a folded (transport) configuration. Hydraulic cylinder  54  may first be actuated to lift the main frame section  12  to the raised transport configuration using rear lift wheels  52  in cooperation with hydraulic cylinder  55  connected to pull hitch  124 . Hydraulic cylinders  60  then actuate toolbar lift wheels  53  to lift wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B to the raised transport position along with main frame section  12 , which toolbar lift wheels  53  are then allowed to caster or pivot. Hydraulic cylinder  58  is then retracted to fold main shank frame  28  up and over tool bar  24  to an inverted position above tool bar  24  ( FIG. 2 ). Main rear auxiliary implement  30  may then also be moved to a raised position. Then the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F of the wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B are folded upwards to a position at or near vertical by retracting hydraulic cylinders  68 . Gauge wheel assemblies  56  and  70  may also be retracted at this point using hydraulic cylinders  62  and  64 , respectively. Wing section rear auxiliary implements  78  may then also be folded upwards to a position at or near vertical using hydraulic cylinders  90 . A telescoping hitch lock cylinder  126  is then retracted, releasing pull hitch tube  20  to telescope. Wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B are then folded forward by left main fold hydraulic cylinder  116 A and right main fold hydraulic cylinder  116 B about generally vertical axes which pass through intermediate wings  13 A and  13 B to a position adjacent to and generally parallel with pull hitch tube  20 . For unfolding the agricultural tillage implement  10  to the operating configuration, the reverse folding sequence is carried out. 
         [0038]    As shown in  FIG. 6 , the draft linkage assembly  200  may include diagonally angled draft tubes  72  and a pivoting swing arm  98  configured as a bell crank arrangement  100 . A hydraulic cylinder  110  serves to rotate pivoting swing arm  98  inwards toward right inner wing section  14 B upon contraction, and serves to rotate pivoting swing arm  98  outwards upon extension. Pivoting the pivoting swing arm  98  inwards towards right inner wing section  14 B allows wing sections  14 B,  16 B, and  18 B to fold to the transport configuration as diagonally angled draft tube  72  nests with pivoting swing arm  98 , whereas pivoting the pivoting swing arm  98  outwards allows wing sections  14 B,  16 B, and  18 B to unfold to the operating configuration while still allowing right inner wing shank frame  66 B to pivot to the generally horizontal position. A symmetrically opposite draft linkage assembly  200  is of course provided for left inner wing section  14 A, left middle wing section  16 A, and left outer wing section  18 A. 
         [0039]    Turning now to  FIG. 7 , a schematic illustration of an exemplary tillage implement hydraulic system  900  upon which an embodiment of the present invention may be used is shown. The tillage implement hydraulic system  900  includes a right wing front shank frame hydraulic subsystem  902 , a left wing front shank frame hydraulic subsystem  904 , a right wing rear auxiliary implement hydraulic subsystem  906 , and a left wing rear auxiliary implement hydraulic subsystem  908 . When transitioning from the operating configuration to the transport configuration, hydraulic pressure and flow is admitted to the tillage implement hydraulic system  900 , whereupon part of the hydraulic pressure and flow then proceeds to the to the main shank frame hydraulic cylinder  928  by way of first main shank frame solenoid operated normally closed two position one way valve  910  and first main shank frame hydraulic flow control valve  914 . Thereafter, this part of the hydraulic pressure and flow passes through second main shank frame hydraulic flow control valve  916  and second main shank frame solenoid operated normally closed two position one way valve  912 . 
         [0040]    Another part of the hydraulic pressure and flow then proceeds to 50/50 hydraulic flow divider and combiner  924  by way of first solenoid operated normally closed two way poppet valve  920 . Hydraulic flow and pressure proceeding from the hydraulic flow divider and combiner  924 , having been divided between hydraulic flow and pressure going to the right wing front shank frame hydraulic subsystem  902  and right wing rear auxiliary implement hydraulic subsystem  906 , and that going to the left wing front shank frame hydraulic subsystem  904  and left wing rear auxiliary implement hydraulic subsystem  908 , then passes through right wing front shank frame hydraulic flow control valves  930 A,  930 B,  930 C, and right wing rear auxiliary implement hydraulic flow control valves  934 A,  934 B,  934 C, and through left wing front shank frame hydraulic flow control valves  932 A,  932 B,  932 C, and left wing rear auxiliary implement hydraulic flow control valves  936 A,  936 B,  936 C, respectively. The hydraulic flow and pressure is then admitted into right wing front shank frame hydraulic cylinders  938 A,  938 B,  938 C, and right wing rear auxiliary implement hydraulic cylinders  942 A,  942 B,  942 C, and into left wing front shank frame hydraulic cylinders  940 A,  940 B,  940 C, and left wing rear auxiliary implement hydraulic cylinders  944 A,  944 B,  944 C, respectively. 
         [0041]    Right wing front shank frame hydraulic cylinders  938 A,  938 B, and  938 C, and left wing front shank frame hydraulic cylinders  940 A,  940 B, and  940 C represent the hydraulic cylinders  68  shown in  FIGS. 1, 4, and 5 . Right wing rear auxiliary implement hydraulic cylinders  942 A,  942 B, and  942 C, and left wing rear auxiliary implement hydraulic cylinders  944 A,  944 B, and  944 C represent the hydraulic cylinders  90  shown in  FIG. 5 . The hydraulic flow and pressure then returns from the tillage implement hydraulic system  900  by way of second solenoid operated normally closed two way poppet valve  922 . By way of the hydraulic arrangement shown in  FIG. 7 , the tillage implement hydraulic system  900  functions to coordinate the motions of the main shank frame  28 , the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F, and the wing section rear auxiliary implements  78  as the agricultural tillage implement  10  transitions from the operating configuration to the transport configuration and vice versa. 
         [0042]    Each of the first main shank frame solenoid operated normally closed two position one way valve  910 , the second main shank frame solenoid operated normally closed two position one way valve  912 , the first solenoid operated normally closed two way poppet valve  920 , and the second solenoid operated normally closed two way poppet valve  922  may be connected to a controller  946 . The controller  946  may be operable to selectively coordinate the main shank frame hydraulic cylinder  928  and the right wing front shank frame hydraulic cylinders  938 A,  938 B, and  938 C, the left wing front shank frame hydraulic cylinders  940 A,  940 B, and  940 C the right wing rear auxiliary implement hydraulic cylinders  942 A,  942 B, and  942 C, and the left wing rear auxiliary implement hydraulic cylinders  944 A,  944 B, and  944 C, to function as described previously. 
         [0043]    Turning now to  FIG. 8 , a schematic illustration of another exemplary tillage implement hydraulic system  600  upon which an embodiment of the present invention may be used is shown. The tillage implement hydraulic system  600  includes a right wing front shank frame hydraulic subsystem  602 , a left wing front shank frame hydraulic subsystem  604 , a right wing rear auxiliary implement hydraulic subsystem  606 , and a left wing rear auxiliary implement hydraulic subsystem  608 . When transitioning from the operating configuration to the transport configuration, hydraulic pressure and flow is admitted to the tillage implement hydraulic system  600 , whereupon the hydraulic pressure and flow passes through a first check valve  610  upon entering manifold  652 . 
         [0044]    Part of the hydraulic pressure and flow then proceeds to main shank frame hydraulic cylinder  628  by way of main shank frame hydraulic flow control valve  626 . Thereafter, this part of the hydraulic pressure and flow passes back into the manifold  652 , then passes through a first spring biased vent to open directional blocking valve  614  in parallel with third check valve  648 , and returns from the tillage implement hydraulic system  600  by way of fourth check valve  650 . When transitioning from the transport configuration to the operating configuration, the hydraulic pressure and flow are reversed, with the first spring biased vent to open directional blocking valve  614  being piloted by hydraulic pressure taken from the tillage implement hydraulic system  600  immediately after fourth check valve  650  by way of a hydraulic flow restrictor  614 A. Hydraulic pressure piloting the first spring biased vent to open directional blocking valve  614  is limited by a first hydraulic pressure control valve  612 . The hydraulic flow then returns from the tillage implement hydraulic system  600  by way of first check valve  610 . 
         [0045]    When transitioning from the operating configuration to the transport configuration, another part of the hydraulic pressure and flow, along with that which proceeds to the main shank frame hydraulic cylinder  628 , then proceeds to 50/50 hydraulic flow divider and combiner  624  by way of second spring biased vent to open directional blocking valve  618  in parallel with second check valve  646  and by way of first solenoid operated normally closed two way poppet valve  620 . The second spring biased vent to open directional blocking valve  618  is piloted by hydraulic pressure taken from the tillage implement hydraulic system  600  immediately after first check valve  610  by way of a hydraulic flow restrictor  618 A. Hydraulic pressure piloting the second spring biased vent to open directional blocking valve  618  is limited by a second hydraulic pressure control valve  616 . 
         [0046]    Hydraulic flow and pressure proceeding from the hydraulic flow divider and combiner  624 , having been divided between hydraulic flow and pressure going to the right wing front shank frame hydraulic subsystem  602  and right wing rear auxiliary implement hydraulic subsystem  606 , and that going to the left wing front shank frame hydraulic subsystem  604  and left wing rear auxiliary implement hydraulic subsystem  608 , then passes through right wing front shank frame hydraulic flow restrictors  630 A,  630 B,  630 C, and right wing rear auxiliary implement hydraulic flow restrictors  634 A,  634 B,  634 C, and through left wing front shank frame hydraulic flow restrictors  632 A,  632 B,  632 C, and left wing rear auxiliary implement hydraulic flow restrictors  636 A,  636 B,  636 C, respectively. The hydraulic flow and pressure is then admitted into right wing front shank frame hydraulic cylinders  638 A,  638 B,  638 C, and right wing rear auxiliary implement hydraulic cylinders  642 A,  642 B,  642 C, and into left wing front shank frame hydraulic cylinders  640 A,  640 B,  640 C, and left wing rear auxiliary implement hydraulic cylinders  644 A,  644 B,  644 C, respectively. 
         [0047]    Right wing front shank frame hydraulic cylinders  638 A,  638 B, and  638 C, and left wing front shank frame hydraulic cylinders  640 A,  640 B, and  640 C represent the hydraulic cylinders  68  shown in  FIGS. 1, 4, and 5 . Right wing rear auxiliary implement hydraulic cylinders  642 A,  642 B, and  642 C, and left wing rear auxiliary implement hydraulic cylinders  644 A,  644 B, and  644 C represent the hydraulic cylinders  90  shown in  FIG. 5 . The hydraulic flow and pressure then returns from the tillage implement hydraulic system  600  by way of manifold  652 , second solenoid operated normally closed two way poppet valve  622 , and fourth check valve  650 . By way of the hydraulic arrangement shown in  FIG. 8 , the tillage implement hydraulic system  600  functions to coordinate the motions of the main shank frame  28 , the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F, and the wing section rear auxiliary implements  78  as the agricultural tillage implement  10  transitions from the operating configuration to the transport configuration and vice versa. A controller  654  connected to the first solenoid operated normally closed two way poppet valve  620  and to the second solenoid operated normally closed two way poppet valve  622  may be operable to selectively coordinate the main shank frame hydraulic cylinder  628  and the right wing front shank frame hydraulic cylinders  638 A,  638 B, and  638 C, the left wing front shank frame hydraulic cylinders  640 A,  640 B, and  640 C the right wing rear auxiliary implement hydraulic cylinders  642 A,  642 B, and  642 C, and the left wing rear auxiliary implement hydraulic cylinders  644 A,  644 B, and  644 C, to function as described previously. 
         [0048]    Turning now to  FIG. 9 , a schematic illustration of a hitch lock hydraulic system  700  upon which an embodiment of the present invention may be used, along with being used with either of the tillage implement hydraulic systems  600  or  900 , is shown. Hydraulic pressure and flow is admitted to the hitch lock hydraulic system  700 , whereupon the hydraulic pressure and flow passes through a first pilot to open check valve  702 , and then proceeds to the hitch lock cylinder  706 . Hydraulic flow then exists the hitch lock hydraulic system  700  by way of second pilot to open check valve  704 . The first pilot to open check valve  702  receives pilot pressure from hydraulic pressure and flow exiting the hitch lock hydraulic system  700 , and the second pilot to open check valve  704  receives pilot pressure from hydraulic pressure and flow entering the hitch lock hydraulic system  700 . Although illustrated as separate pilot to open check valves  702 ,  704 , a dual pilot to open check valve may be used. Hitch lock cylinder  706  corresponds to the hitch lock cylinder  126  shown in  FIGS. 1 and 2 . 
         [0049]    Turning now to  FIG. 10 , a schematic illustration of a main fold, pivoting swing arm, and pull hitch hydraulic system  800  upon which an embodiment of the present invention may be used, along with being used with either of the tillage implement hydraulic systems  600 ,  900 , and/or  700 , is shown. Hydraulic pressure and flow is admitted to the main fold, pivoting swing arm, and pull hitch hydraulic system  800 , whereupon the hydraulic pressure and flow passes through a first solenoid operated normally closed two way poppet valve  802 . Part of the hydraulic pressure and flow then proceeds to the pull hitch hydraulic cylinder  806 , which represents hydraulic cylinder  55  in  FIGS. 1-5 . Hydraulic flow from the pull hitch hydraulic cylinder  806  then exits the main fold, pivoting swing arm, and pull hitch hydraulic system  800  by way of a second solenoid operated normally closed two way poppet valve  804 . 
         [0050]    Another part of the hydraulic pressure and flow proceeds to a  50 / 50  wing fold hydraulic flow divider and combiner  810  by way of a first hydraulic flow control valve  808 . One divided part of the hydraulic flow and pressure proceeding from the hydraulic flow divider and combiner  810  is then admitted into right pivoting swing arm hydraulic cylinder  812 , which represents pivoting swing arm hydraulic cylinder  110  in  FIG. 6 , and, in parallel, into right main fold hydraulic cylinder  820 , which represents right main fold hydraulic cylinder  116 B in  FIGS. 1, 3 , and  6 , by way of right main fold hydraulic flow control valve  824 . The other divided part of the hydraulic flow and pressure proceeding from the hydraulic flow divider and combiner  810  is then admitted into left pivoting swing arm hydraulic cylinder  814 , which represents the pivoting swing arm hydraulic cylinder opposite pivoting swing arm hydraulic cylinder  110  in  FIG. 6 , and, in parallel, into left main fold hydraulic cylinder  822 , which represents the left main fold hydraulic cylinder  116 A in  FIGS. 1, 3, and 6 , by way of left main fold hydraulic flow control valve  826 . Hydraulic flow proceeding from right pivoting swing arm hydraulic cylinder  812  by way of right pivoting swing arm hydraulic flow control valve  816 , from left pivoting swing arm hydraulic cylinder  814  by way of left pivoting swing arm hydraulic flow control valve  818 , from right main fold hydraulic cylinder  820 , and from left main fold hydraulic cylinder  822 , then recombines and exits the main fold, pivoting swing arm, and pull hitch hydraulic system  800  by way of the second solenoid operated normally closed two way poppet valve  804 . 
         [0051]    Pull hitch hydraulic cylinder  806 , right pivoting swing arm hydraulic cylinder  812 , left pivoting swing arm hydraulic cylinder  814 , left main fold hydraulic cylinder  822 , and right main fold hydraulic cylinder  820  represent pull hitch hydraulic cylinder  55 , right and left pivoting swing arm hydraulic cylinders  110 , left main fold hydraulic cylinder  116 A, and right main fold hydraulic cylinder  116 B, respectively, shown variously in  FIGS. 1 through 6 . The hitch lock hydraulic system  700  and main fold, pivoting swing arm, and pull hitch hydraulic system  800 , in combination with tillage implement hydraulic system  600  or  900 , functions to coordinate the motions of the telescoping hitch lock cylinder  126 , the pull hitch  124 , the draft linkage assemblies  200 , the forward folding wing sections  14 A,  14 B,  16 A,  16 B,  18 A, and  18 B, the main shank frame  28 , the wing front shank frames  66 A,  66 B,  66 C,  66 D,  66 E, and  66 F, and the wing section rear auxiliary implements  78  as the agricultural tillage implement  10  transitions from the operating configuration to the transport configuration and vice versa. This is accomplished by way of the hydraulic arrangements shown in  FIGS. 9 and 10 , in combination with either of the hydraulic arrangements shown in  FIG. 7 or 8 . A controller  828  connected to first solenoid operated normally closed two way poppet valve  802  and to second solenoid operated normally closed two way poppet valve  804  may be operable to selectively coordinate the pull hitch hydraulic cylinder  806 , the right pivoting swing arm hydraulic cylinder  812 , the left pivoting swing arm hydraulic cylinder  814 , the right main fold hydraulic cylinder  820 , and the left main fold hydraulic cylinder  822  with the other hydraulic cylinders of the agricultural tillage implement, as described previously. 
         [0052]    Turning now to  FIG. 11 , a schematic illustration of a tillage implement hydraulic system  300  upon which an embodiment of the present invention may be used, along with being used with tillage implement hydraulic systems  700 ,  800 , and  600  or  900 , is shown. The tillage implement hydraulic system  300  includes a right wing front gauge wheel hydraulic subsystem  302 , a left wing front gauge wheel hydraulic subsystem  304 , a right wing rear lift wheel hydraulic subsystem  306 , and a left wing rear lift wheel hydraulic subsystem  308 . Hydraulic pressure and flow is selectively admitted to the tillage implement hydraulic system  300  by a first solenoid operated normally closed directional control check valve with manual override  310 , whereupon the hydraulic pressure and flow proceeds to a first hydraulic flow divider and combiner  312 , which splits the hydraulic flow between the rear lift wheel hydraulic subsystems  306 ,  308 , and the front gauge wheel hydraulic subsystems  302 ,  304 , respectively. A first solenoid operated normally closed two way poppet bypass valve  314  interconnects the hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  306 ,  308 , and to the front gauge wheel hydraulic subsystems  302 ,  304 , subsequent to its division by the first hydraulic flow divider and combiner  312 , which first solenoid operated normally closed two way poppet bypass valve  314  may selectively rejoin the flow proceeding from the first hydraulic flow divider and combiner  312  for use in one or the other of the rear lift wheel hydraulic subsystems  306 ,  308 , or the front gauge wheel hydraulic subsystems  302 ,  304 , according to need. In this way, actuation of hydraulic cylinders within the rear lift wheel hydraulic subsystems  306 ,  308 , and within the front gauge wheel hydraulic subsystems  302 ,  304  may be accomplished in coordinated fashion by use of the first hydraulic flow divider and combiner  312 , or may be accomplished selectively by rejoining the flow proceeding from the first hydraulic flow divider and combiner  312  using the first solenoid operated normally closed two way poppet bypass valve  314 . 
         [0053]    The hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  306 ,  308 , is then further split in a second hydraulic flow divider and combiner  316  between the right wing rear lift wheel hydraulic subsystem  306  and the left wing rear lift wheel hydraulic subsystem  308 . A second solenoid operated normally closed two way poppet bypass valve  318  interconnects the hydraulic flow proceeding to the right wing rear lift wheel hydraulic subsystem  306  and to the left wing rear lift wheel hydraulic subsystem  308 , subsequent to its division by the second hydraulic flow divider and combiner  316 , which second solenoid operated normally closed two way poppet bypass valve  318  may selectively rejoin the flow proceeding from the second hydraulic flow divider and combiner  316  for use in one or the other of the right wing rear lift wheel hydraulic subsystem  306  or the left wing rear lift wheel hydraulic subsystem  308 , according to need. In this way, actuation of hydraulic cylinders within the right wing rear lift wheel hydraulic subsystem  306  and within the left wing rear lift wheel hydraulic subsystem  308  may be accomplished in coordinated fashion by use of the second hydraulic flow divider and combiner  316 , or may be accomplished selectively by rejoining the flow proceeding from the second hydraulic flow divider and combiner  316  using the second solenoid operated normally closed two way poppet bypass valve  318 . 
         [0054]    The hydraulic flow proceeding to the front gauge wheel hydraulic subsystems  302 ,  304 , is then further split in a third hydraulic flow divider and combiner  320  between the right wing front gauge wheel hydraulic subsystem  302  and the left wing front gauge wheel hydraulic subsystem  304 . A third solenoid operated normally closed two way poppet bypass valve  322  interconnects the hydraulic flow proceeding to the right wing front gauge wheel hydraulic subsystem  302  and the left wing front gauge wheel hydraulic subsystem  304 , subsequent to its division by the third hydraulic flow divider and combiner  320 , which third solenoid operated normally closed two way poppet bypass valve  322  may selectively rejoin the flow proceeding from the third hydraulic flow divider and combiner  320  for use in one or the other of the right wing front gauge wheel hydraulic subsystem  302  or the left wing front gauge wheel hydraulic subsystem  304 , according to need. In this way, actuation of hydraulic cylinders within the right wing front gauge wheel hydraulic subsystem  302  and within the right wing front gauge wheel hydraulic subsystem  304  may be accomplished in coordinated fashion by use of the third hydraulic flow divider and combiner  320 , or may be accomplished selectively by rejoining the flow proceeding from the third hydraulic flow divider and combiner  320  using the third solenoid operated normally closed two way poppet bypass valve  322 . 
         [0055]    Hydraulic flow and pressure proceeding from the second hydraulic flow divider and combiner  316  and/or the second solenoid operated normally closed two way poppet bypass valve  318  then passes through a first pilot operated check valve  324  or a second pilot operated check valve  326  before proceeding to the right wing rear lift wheel hydraulic subsystem  306  or to the left wing rear lift wheel hydraulic subsystem  308 , respectively. Hydraulic flow and pressure proceeding from the third hydraulic flow divider and combiner  320  and/or the third solenoid operated normally closed two way poppet bypass valve  322  then passes through a third pilot operated check valve  328  or a fourth pilot operated check valve  330  before proceeding to the right wing front gauge wheel hydraulic subsystem  302  or the left wing front gauge wheel hydraulic subsystem  304 , respectively. 
         [0056]    Each of the first solenoid operated normally closed directional control check valve with manual override  310 , the first hydraulic flow divider and combiner  312 , the first solenoid operated normally closed two way poppet bypass valve  314 , the second hydraulic flow divider and combiner  316 , the second solenoid operated normally closed two way poppet bypass valve  318 , the third hydraulic flow divider and combiner  320 , the third solenoid operated normally closed two way poppet bypass valve  322 , the first pilot operated check valve  324 , the second pilot operated check valve  326 , the third pilot operated check valve  328 , and the fourth pilot operated check valve  330  may be contained within a manifold  358 . 
         [0057]    The right wing front gauge wheel hydraulic subsystem  302  has at least one right wing front gauge wheel hydraulic cylinder  340 , four being illustrated in the embodiment of the tillage implement hydraulic system  300  shown in  FIG. 11 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 . Right wing front gauge wheel hydraulic cylinder  340 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward right corner of the main shank frame  28  shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  340 B,  340 C, and  340 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F, respectively, shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, and  340 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0058]    The first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A shown in  FIG. 11  is configured to normally apply hydraulic flow and pressure received from the third pilot operated check valve  328  to the right wing front gauge wheel hydraulic cylinder  340 A, and upon energization to divert the hydraulic flow and pressure to a right wing front gauge wheel bypass valve  348 A. Each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 B,  332 C,  332 D is configured to normally apply hydraulic flow and pressure received from the previous right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, respectively, to its own right wing front gauge wheel hydraulic cylinder  340 B,  340 C,  340 D, respectively. Upon energization, each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 B,  332 C,  332 D is configured to apply hydraulic flow and pressure received from right wing front gauge wheel bypass valve  348 A via respective right wing front gauge wheel bypass valve  348 B,  348 C,  348 D, respectively, to its own right wing front gauge wheel hydraulic cylinder  340 B,  340 C,  340 D, respectively. 
         [0059]    In this way, the actuation of the right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, and  340 D may be coordinated by leaving the right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A,  332 B,  332 C, and  332 D de-energized so that displacement of each of right wing front gauge wheel hydraulic cylinders  340 A,  340 B, and  340 C forces hydraulic fluid into each of subsequent right wing front gauge wheel hydraulic cylinders  340 B,  340 C, and  340 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinder  340 A, right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A and  332 B are energized, along with right wing front gauge wheel bypass valves  348 A and  348 B, thereby bypassing right wing front gauge wheel hydraulic cylinder  340 A and actuating remaining right wing front gauge wheel hydraulic cylinders  340 B,  340 C, and  340 D. Similarly, if it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  340 A and  340 B, right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A and  332 C are energized, along with right wing front gauge wheel bypass valves  348 A and  348 C, thereby bypassing right wing front gauge wheel hydraulic cylinders  340 A and  340 B and actuating remaining right wing front gauge wheel hydraulic cylinders  340 C and  340 D. Similarly, if it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  340 A,  340 B, and  340 C, right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A and  332 D are energized, along with right wing front gauge wheel bypass valves  348 A and  348 D, thereby bypassing right wing front gauge wheel hydraulic cylinders  340 A,  340 B, and  340 C, and actuating remaining right wing front gauge wheel hydraulic cylinder  340 D. 
         [0060]    Similarly, the left wing front gauge wheel hydraulic subsystem  304  has at least one left wing front gauge wheel hydraulic cylinder  342 , four being illustrated in the embodiment of the tillage implement hydraulic system  300  shown in  FIG. 11 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 . Left wing front gauge wheel hydraulic cylinder  342 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward left corner of the main shank frame  28  shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  342 B,  342 C, and  342 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on left inner wing front shank frame  66 A, left middle wing front shank frame  66 C, and left outer wing front shank frame  66 E, respectively, shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0061]    The first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A shown in  FIG. 11  is configured to normally apply hydraulic flow and pressure received from the fourth pilot operated check valve  330  to the left wing front gauge wheel hydraulic cylinder  342 A, and upon energization to divert the hydraulic flow and pressure to a left wing front gauge wheel bypass valve  350 A. Each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 B,  334 C,  334 D is configured to normally apply hydraulic flow and pressure received from the previous left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, respectively, to its own left wing front gauge wheel hydraulic cylinder  342 B,  342 C,  342 D, respectively. Upon energization, each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 B,  334 C,  334 D is configured to apply hydraulic flow and pressure received from left wing front gauge wheel bypass valve  350 A via respective left wing front gauge wheel bypass valve  350 B,  350 C,  350 D, respectively, to its own left wing front gauge wheel hydraulic cylinder  342 B,  342 C,  342 D, respectively. 
         [0062]    In this way, the actuation of the left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D may be coordinated by leaving the left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 A,  334 B,  334 C, and  334 D de-energized so that displacement of each of left wing front gauge wheel hydraulic cylinders  342 A,  342 B, and  342 C forces hydraulic fluid into each of subsequent left wing front gauge wheel hydraulic cylinders  342 B,  342 C, and  342 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinder  342 A, left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 A and  334 B are energized, along with left wing front gauge wheel bypass valves  350 A and  350 B, thereby bypassing left wing front gauge wheel hydraulic cylinder  342 A and actuating remaining left wing front gauge wheel hydraulic cylinders  342 B,  342 C, and  342 D. Similarly, if it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  342 A and  342 B, left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 A and  334 C are energized, along with left wing front gauge wheel bypass valves  350 A and  350 C, thereby bypassing left wing front gauge wheel hydraulic cylinders  342 A and  342 B and actuating remaining left wing front gauge wheel hydraulic cylinders  342 C and  342 D. Similarly, if it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  342 A,  342 B, and  342 C, left wing front gauge wheel hydraulic cylinder three way solenoid valves  334 A and  334 D are energized, along with left wing front gauge wheel bypass valves  350 A and  350 D, thereby bypassing left wing front gauge wheel hydraulic cylinders  342 A,  342 B, and  342 C, and actuating remaining left wing front gauge wheel hydraulic cylinder  342 D. 
         [0063]    Similarly, the right wing rear lift wheel hydraulic subsystem  306  has at least one right wing rear lift wheel hydraulic cylinder  344 , four being illustrated in the embodiment of the tillage implement hydraulic system shown in  FIG. 11 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 . Right wing rear lift wheel hydraulic cylinder  344 A may correspond to a right hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Right wing rear lift wheel hydraulic cylinders  344 B,  344 C, and  344 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on right inner wing section  14 B, right middle wing section  16 B, and right outer wing section  18 B, respectively, shown in  FIG. 1 . Alternately, each of the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D may correspond to hydraulic cylinders  60  actuating lift wheels  53  on right wing sections  14 B,  16 B,  18 B. Right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0064]    The first right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 A shown in  FIG. 11  is configured to normally apply hydraulic flow and pressure received from the first pilot operated check valve  324  to the right wing rear lift wheel hydraulic cylinder  344 A, and upon energization to divert the hydraulic flow and pressure to a right wing rear lift wheel bypass valve  352 A. Each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 B,  336 C,  336 D is configured to normally apply hydraulic flow and pressure received from the previous right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, respectively, to its own right wing rear lift wheel hydraulic cylinders  344 B,  344 C,  344 D, respectively. Upon energization, each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 B,  336 C,  336 D is configured to apply hydraulic flow and pressure received from right wing rear lift wheel bypass valve  352 A via respective right wing rear lift wheel bypass valve  352 B,  352 C,  352 D, respectively, to its own right wing rear lift wheel hydraulic cylinders  344 B,  344 C,  344 D, respectively. 
         [0065]    In this way, the actuation of the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D may be coordinated by leaving the right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A,  336 B,  336 C, and  336 D de-energized so that displacement of each of right wing rear lift wheel hydraulic cylinders  344 A,  344 B, and  344 C forces hydraulic fluid into each of subsequent right wing rear lift wheel hydraulic cylinders  344 B,  344 C, and  344 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinder  344 A, right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A and  336 B are energized, along with right wing rear lift wheel bypass valves  352 A and  352 B, thereby bypassing right wing rear lift wheel hydraulic cylinder  344 A and actuating remaining right wing rear lift wheel hydraulic cylinders  344 B,  344 C, and  344 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  344 A and  344 B, right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A and  336 C are energized, along with right wing rear lift wheel bypass valves  352 A and  352 C, thereby bypassing right wing rear lift wheel hydraulic cylinders  344 A and  344 B and actuating remaining right wing rear lift wheel hydraulic cylinders  344 C and  344 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  344 A,  344 B, and  344 C, right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A and  336 D are energized, along with right wing rear lift wheel bypass valves  352 A and  352 D, thereby bypassing right wing rear lift wheel hydraulic cylinders  344 A,  344 B, and  344 C, and actuating remaining right wing rear lift wheel hydraulic cylinder  344 D. 
         [0066]    Similarly, the left wing rear lift wheel hydraulic subsystem  308  has at least one left wing rear lift wheel hydraulic cylinder  346 , four being illustrated in the embodiment of the tillage implement hydraulic system shown in  FIG. 11 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 . Left wing rear lift wheel hydraulic cylinder  346 A may correspond to a left hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Left wing rear lift wheel hydraulic cylinders  346 B,  346 C, and  346 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on left inner wing section  14 A, left middle wing section  16 A, and left outer wing section  18 A, respectively, shown in  FIG. 1 . Left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0067]    The first left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 A shown in  FIG. 11  is configured to normally apply hydraulic flow and pressure received from the second pilot operated check valve  326  to the left wing rear lift wheel hydraulic cylinder  346 A, and upon energization to divert the hydraulic flow and pressure to a left wing rear lift wheel bypass valve  354 A. Each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 B,  338 C,  338 D is configured to normally apply hydraulic flow and pressure received from the previous left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, respectively, to its own left wing rear lift wheel hydraulic cylinders  346 B,  346 C,  346 D, respectively. Upon energization, each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 B,  338 C,  338 D is configured to apply hydraulic flow and pressure received from left wing rear lift wheel bypass valve  354 A via respective left wing rear lift wheel bypass valve  354 B,  354 C,  354 D, respectively, to its own left wing rear lift wheel hydraulic cylinders  346 B,  346 C,  346 D, respectively. 
         [0068]    In this way, the actuation of the left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D may be coordinated by leaving the left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A,  338 B,  338 C, and  338 D de-energized so that displacement of each of left wing rear lift wheel hydraulic cylinders  346 A,  346 B, and  346 C forces hydraulic fluid into each of subsequent left wing rear lift wheel hydraulic cylinders  346 B,  346 C, and  346 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinder  346 A, left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A and  338 B are energized, along with left wing rear lift wheel bypass valves  354 A and  354 B, thereby bypassing left wing rear lift wheel hydraulic cylinder  346 A and actuating remaining left wing rear lift wheel hydraulic cylinders  346 B,  346 C, and  346 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  346 A and  346 B, left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A and  338 C are energized, along with left wing rear lift wheel bypass valves  354 A and  354 C, thereby bypassing left wing rear lift wheel hydraulic cylinders  346 A and  346 B and actuating remaining left wing rear lift wheel hydraulic cylinders  346 C and  346 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  346 A,  346 B, and  346 C, left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A and  338 D are energized, along with left wing rear lift wheel bypass valves  354 A and  354 D, thereby bypassing left wing rear lift wheel hydraulic cylinders  346 A,  346 B, and  346 C, and actuating remaining left wing rear lift wheel hydraulic cylinder  346 D. 
         [0069]    Subsequent to right wing front gauge wheel hydraulic cylinder  340 D, left wing front gauge wheel hydraulic cylinder  342 D, right wing rear lift wheel hydraulic cylinder  344 D, and left wing rear lift wheel hydraulic cylinder  346 D, the hydraulic flow returns from tillage implement hydraulic system  300  via a second solenoid operated normally closed directional control check valve with manual override  356 , which may also be contained within the manifold  358 . 
         [0070]    Each of the first solenoid operated normally closed directional control check valve with manual override  310 , the first solenoid operated normally closed two way poppet bypass valve  314 , the second solenoid operated normally closed two way poppet bypass valve  318 , the third solenoid operated normally closed two way poppet bypass valve  322 , the right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A,  332 B,  332 C, and  332 D, the left wing front gauge hydraulic cylinder three way solenoid valves  334 A,  334 B,  334 C, and  334 D, the right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A,  336 B,  336 C, and  336 D, the left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A,  338 B,  338 C, and  338 D, the right wing front gauge wheel bypass valves  348 A,  348 B,  348 C, and  348 D, the left wing front gauge wheel bypass valves  350 A,  350 B,  350 C, and  350 D, the right wing rear lift wheel bypass valves  352 A,  352 B,  352 C, and  352 D, the left wing rear lift wheel bypass valves  354 A,  354 B,  354 C, and  354 D, and the second solenoid operated normally closed directional control check valve with manual override  356  may be connected to a controller  360 . 
         [0071]    The controller  360  may be operable to selectively coordinate the hydraulic cylinders of the right wing front gauge wheel hydraulic subsystem  302 , the left wing front gauge wheel hydraulic subsystem  304 , the right wing rear lift wheel hydraulic subsystem  306 , and the left wing rear lift wheel hydraulic subsystem  308  using the first solenoid operated normally closed two way poppet bypass valve  314 , the second solenoid operated normally closed two way poppet bypass valve  318 , and the third solenoid operated normally closed two way poppet bypass valve  322 , to function as described previously. 
         [0072]    The controller  360  may be further operable to selectively coordinate the right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, and  340 D using the right wing front gauge wheel hydraulic cylinder three way solenoid valves  332 A,  332 B,  332 C, and  332 D, and the right wing front gauge wheel bypass valves  348 A,  348 B,  348 C, and  348 D, as described previously. The controller  360  may be further operable to selectively coordinate the left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D using the left wing front gauge hydraulic cylinder three way solenoid valves  334 A,  334 B,  334 C, and  334 D, and the left wing front gauge wheel bypass valves  350 A,  350 B,  350 C, and  350 D, as described previously. The controller  360  may be further operable to selectively coordinate the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D using the right wing rear lift wheel hydraulic cylinder three way solenoid valves  336 A,  336 B,  336 C, and  336 D, and the right wing rear lift wheel bypass valves  352 A,  352 B,  352 C, and  352 D, as described previously. The controller  360  may be further operable to selectively coordinate the left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D using the left wing rear lift wheel hydraulic cylinder three way solenoid valves  338 A,  338 B,  338 C, and  338 D, and the left wing rear lift wheel bypass valves  354 A,  354 B,  354 C, and  354 D, as described previously. 
         [0073]    Each of the right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, and  340 D may be provided with a right wing front gauge wheel hydraulic cylinder displacement detecting device  362 A,  362 B,  362 C, and  362 D, respectively. The right wing front gauge wheel hydraulic cylinder displacement detecting devices  362 A,  362 B,  362 C, and  362 D may each be connected to the controller  360  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C,  340 D. Each of the left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D may be provided with a left wing front gauge wheel hydraulic cylinder displacement detecting device  364 A,  364 B,  364 C, and  364 D, respectively. The left wing front gauge wheel hydraulic cylinder displacement detecting devices  364 A,  364 B,  364 C, and  364 D may each be connected to the controller  360  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D. 
         [0074]    Each of the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D may be provided with a right wing rear lift wheel hydraulic cylinder displacement detecting device  366 A,  366 B,  366 C, and  366 D, respectively. The right wing rear lift wheel hydraulic cylinder displacement detecting devices  366 A,  366 B,  366 C, and  366 D may each be connected to the controller  360  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D. Each of the left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D may be provided with a left wing rear lift wheel hydraulic cylinder displacement detecting device  368 A,  368 B,  368 C, and  368 D, respectively. The left wing rear lift wheel hydraulic cylinder displacement detecting device  368 A,  368 B,  368 C, and  368 D may each be connected to the controller  360  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D. 
         [0075]    A rheostat type of sensor is shown in  FIG. 11 , although any kind of sensor producing an output proportional to sensed displacement may be used. The controller  360  may calibrate the right wing front gauge wheel hydraulic cylinders  340 A,  340 B,  340 C, and  340 D, the left wing front gauge wheel hydraulic cylinders  342 A,  342 B,  342 C, and  342 D, the right wing rear lift wheel hydraulic cylinders  344 A,  344 B,  344 C, and  344 D, and the left wing rear lift wheel hydraulic cylinders  346 A,  346 B,  346 C, and  346 D by first extending each to its maximum length. Individual readings are then taken from the hydraulic cylinder displacement detecting devices  362 A,  362 B,  362 C,  362 D,  364 A,  364 B,  364 C,  364 D,  366 A,  366 B,  366 C,  366 D,  368 A,  368 B,  368 C, and  368 D. The agricultural tillage implement  10  is then lowered so that the tools, in this embodiment the cultivator shanks  36 , just touch the level surface. Once this condition is achieved, individual readings are again taken from the hydraulic cylinder displacement detecting devices  362 A,  362 B,  362 C,  362 D,  364 A,  364 B,  364 C,  364 D,  366 A,  366 B,  366 C,  366 D,  368 A,  368 B,  368 C, and  368 D. These displacement signals may then be stored in the controller  360 , and provide the synchronized set point for the displacement detecting devices  362 A,  362 B,  362 C,  362 D,  364 A,  364 B,  364 C,  364 D,  366 A,  366 B,  366 C,  366 D,  368 A,  368 B,  368 C, and  368 D. 
         [0076]    Periodically during the operation of the agricultural tillage implement  10 , the readings of the hydraulic cylinder displacement detecting devices  362 A,  362 B,  362 C,  362 D,  364 A,  364 B,  364 C,  364 D,  366 A,  366 B,  366 C,  366 D,  368 A,  368 B,  368 C, and  368 D may be determined and, if they deviate from the set point initially established, the controller  360  corrects the appropriate hydraulic cylinder  340 A,  340 B,  340 C,  340 D,  342 A,  342 B,  342 C,  342 D,  344 A,  344 B,  344 C,  344 D,  346 A,  346 B,  346 C, or  346 D to achieve the intended set point. This may be done independently of other hydraulic cylinders using the methods described previously. The agricultural tillage implement  10  is then able to provide accurate depth of penetration of the tools, in this embodiment the cultivator shanks  36 . 
         [0077]    Turning now to  FIG. 12 , a schematic illustration of a tillage implement hydraulic system  400  upon which an embodiment of the present invention may be used, along with being used with tillage implement hydraulic systems  700 ,  800 ,  600  or  900 , and  300 , is shown. The tillage implement hydraulic system  400  includes a right wing front gauge wheel hydraulic subsystem  402 , a left wing front gauge wheel hydraulic subsystem  404 , a right wing rear lift wheel hydraulic subsystem  406 , and a left wing rear lift wheel hydraulic subsystem  408 . Hydraulic pressure and flow is selectively admitted to the tillage implement hydraulic system  400  by a first solenoid operated normally closed directional control check valve with manual override  410 , whereupon the hydraulic pressure and flow proceeds to a first hydraulic flow divider and combiner  412 , which splits the hydraulic flow between the rear lift wheel hydraulic subsystems  406 ,  408 , and the front gauge wheel hydraulic subsystems  402 ,  404 , respectively. A first solenoid operated normally closed two way poppet bypass valve  414  interconnects the hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  406 ,  408 , and to the front gauge wheel hydraulic subsystems  402 ,  404 , subsequent to its division by the first hydraulic flow divider and combiner  412 , which first solenoid operated normally closed two way poppet bypass valve  414  may selectively rejoin the flow proceeding from the first hydraulic flow divider and combiner  412  for use in one or the other of the rear lift wheel hydraulic subsystems  406 ,  408 , or the front gauge wheel hydraulic subsystems  402 ,  404 , according to need. In this way, actuation of hydraulic cylinders within the rear lift wheel hydraulic subsystems  406 ,  408 , and within the front gauge wheel hydraulic subsystems  402 ,  404  may be accomplished in coordinated fashion by use of the first hydraulic flow divider and combiner  412 , or may be accomplished selectively by rejoining the flow proceeding from the first hydraulic flow divider and combiner  412  using the first solenoid operated normally closed two way poppet bypass valve  414 . 
         [0078]    The hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  406 ,  408 , is then further split in a second hydraulic flow divider and combiner  416 , which splits the hydraulic flow between the right wing rear lift wheel hydraulic subsystem  406  and the left wing rear lift wheel hydraulic subsystem  408 . A second solenoid operated normally closed two way poppet bypass valve  418  interconnects the hydraulic flow proceeding to the right wing rear lift wheel hydraulic subsystem  406  and to the left wing rear lift wheel hydraulic subsystem  408 , subsequent to its division by the second hydraulic flow divider and combiner  416 , which second solenoid operated normally closed two way poppet bypass valve  418  may selectively rejoin the flow proceeding from the second hydraulic flow divider and combiner  416  for use in one or the other of the right wing rear lift wheel hydraulic subsystem  406  or the left wing rear lift wheel hydraulic subsystem  408 , according to need. In this way, actuation of hydraulic cylinders within the right wing rear lift wheel hydraulic subsystem  406  and within the left wing rear lift wheel hydraulic subsystem  408  may be accomplished in coordinated fashion by use of the second hydraulic flow divider and combiner  416 , or may be accomplished selectively by rejoining the flow proceeding from the second hydraulic flow divider and combiner  416  using the second solenoid operated normally closed two way poppet bypass valve  418 . 
         [0079]    The hydraulic flow proceeding to the front gauge wheel hydraulic subsystems  402 ,  404 , is then further split in a third hydraulic flow divider and combiner  420 , which splits the hydraulic flow between the right wing front gauge wheel hydraulic subsystem  402  and the left wing front gauge wheel hydraulic subsystem  404 . A third solenoid operated normally closed two way poppet bypass valve  422  interconnects the hydraulic flow proceeding to the right wing front gauge wheel hydraulic subsystem  402  and the left wing front gauge wheel hydraulic subsystem  404 , subsequent to its division by the third hydraulic flow divider and combiner  420 , which third solenoid operated normally closed two way poppet bypass valve  422  may selectively rejoin the flow proceeding from the third hydraulic flow divider and combiner  420  for use in one or the other of the right wing front gauge wheel hydraulic subsystem  402  or the left wing front gauge wheel hydraulic subsystem  404 , according to need. In this way, actuation of hydraulic cylinders within the right wing front gauge wheel hydraulic subsystem  402  and within the right wing front gauge wheel hydraulic subsystem  404  may be accomplished in coordinated fashion by use of the third hydraulic flow divider and combiner  420 , or may be accomplished selectively by rejoining the flow proceeding from the third hydraulic flow divider and combiner  420  using the third solenoid operated normally closed two way poppet bypass valve  422 . 
         [0080]    Hydraulic flow and pressure proceeding from the second hydraulic flow divider and combiner  416  and/or the second solenoid operated normally closed two way poppet bypass valve  418  then passes through a first pilot operated check valve  424  or a second pilot operated check valve  426  before proceeding to the right wing rear lift wheel hydraulic subsystem  406  or to the left wing rear lift wheel hydraulic subsystem  408 , respectively. Hydraulic flow and pressure proceeding from the third hydraulic flow divider and combiner  420  and/or the third solenoid operated normally closed two way poppet bypass valve  422  then passes through a third pilot operated check valve  428  or a fourth pilot operated check valve  430  before proceeding to the right wing front gauge wheel hydraulic subsystem  402  or the left wing front gauge wheel hydraulic subsystem  404 , respectively. 
         [0081]    Each of the first solenoid operated normally closed directional control check valve with manual override  410 , the first hydraulic flow divider and combiner  412 , the first solenoid operated normally closed two way poppet bypass valve  414 , the second hydraulic flow divider and combiner  416 , the second solenoid operated normally closed two way poppet bypass valve  418 , the third hydraulic flow divider and combiner  420 , the third solenoid operated normally closed two way poppet bypass valve  422 , the first pilot operated check valve  424 , the second pilot operated check valve  426 , the third pilot operated check valve  428 , and the fourth pilot operated check valve  430  may be contained within a manifold  458 . 
         [0082]    The right wing front gauge wheel hydraulic subsystem  402  has at least one right wing front gauge wheel hydraulic cylinder  440 , four being illustrated in the embodiment of the tillage implement hydraulic system  400  shown in  FIG. 12 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 . Right wing front gauge wheel hydraulic cylinder  440 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward right corner of the main shank frame  28  shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  440 B,  440 C, and  440 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F, respectively, shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, and  440 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0083]    The first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A shown in  FIG. 12  is configured to normally apply hydraulic flow and pressure received from the third pilot operated check valve  428  to the right wing front gauge wheel hydraulic cylinder  440 A, and upon energization to divert the hydraulic flow and pressure to a right wing front gauge wheel bypass circuit  452 . Each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valve  432 B,  432 C,  432 D is configured to normally apply hydraulic flow and pressure received from the previous right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, respectively, to its own right wing front gauge wheel hydraulic cylinder  440 B,  440 C,  440 D, respectively. Upon energization, each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  432 B,  432 C,  432 D is configured to apply hydraulic flow and pressure received from right wing front gauge wheel bypass circuit  452  to its own right wing front gauge wheel hydraulic cylinder  440 B,  440 C,  440 D, respectively. 
         [0084]    In this way, the actuation of the right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, and  440 D may be coordinated by leaving the right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A,  432 B,  432 C, and  432 D de-energized so that displacement of each of right wing front gauge wheel hydraulic cylinders  440 A,  440 B, and  440 C forces hydraulic fluid into each of subsequent right wing front gauge wheel hydraulic cylinders  440 B,  440 C, and  440 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinder  440 A, right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A and  432 B are energized, thereby bypassing right wing front gauge wheel hydraulic cylinder  440 A and actuating remaining right wing front gauge wheel hydraulic cylinders  440 B,  440 C, and  440 D. Similarly, if it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  440 A and  440 B, right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A and  432 C are energized, thereby bypassing right wing front gauge wheel hydraulic cylinders  440 A and  440 B, and actuating remaining right wing front gauge wheel hydraulic cylinders  440 C and  440 D. If it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  440 A,  440 B, and  440 C, right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A and  432 D are energized, thereby bypassing right wing front gauge wheel hydraulic cylinders  440 A,  440 B, and  440 C, and actuating remaining right wing front gauge wheel hydraulic cylinder  440 D. 
         [0085]    Similarly, the left wing front gauge wheel hydraulic subsystem  404  has at least one left wing front gauge wheel hydraulic cylinder  442 , four being illustrated in the embodiment of the tillage implement hydraulic system  400  shown in  FIG. 12 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 . Left wing front gauge wheel hydraulic cylinder  442 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward left corner of the main shank frame  28  shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  442 B,  442 C, and  442 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on left inner wing front shank frame  66 A, left middle wing front shank frame  66 C, and left outer wing front shank frame  66 E, respectively, shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0086]    The first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A is configured to normally apply hydraulic flow and pressure received from the fourth pilot operated check valve  430  to the left wing front gauge wheel hydraulic cylinder  442 A, and upon energization to divert the hydraulic flow and pressure to a left wing front gauge wheel bypass circuit  454 . Each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  434 B,  434 C,  434 D is configured to normally apply hydraulic flow and pressure received from the previous left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, respectively, to its own left wing front gauge wheel hydraulic cylinder  442 B,  442 C,  442 D, respectively. Upon energization, each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  434 B,  434 C,  434 D is configured to apply hydraulic flow and pressure received from left wing front gauge wheel bypass circuit  454  to its own left wing front gauge wheel hydraulic cylinder  442 B,  442 C,  442 D, respectively. 
         [0087]    In this way, the actuation of the left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D may be coordinated by leaving the left wing front gauge wheel hydraulic cylinder three way solenoid valves  434 A,  434 B,  434 C, and  434 D de-energized so that displacement of each of left wing front gauge wheel hydraulic cylinders  442 A,  442 B, and  442 C forces hydraulic fluid into each of subsequent left wing front gauge wheel hydraulic cylinders  442 B,  442 C, and  442 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinder  442 A, left wing front gauge wheel hydraulic cylinder three way solenoid valves  434 A and  434 B are energized, thereby bypassing left wing front gauge wheel hydraulic cylinder  442 A and actuating remaining left wing front gauge wheel hydraulic cylinders  442 B,  442 C, and  442 D. Similarly, if it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  442 A and  442 B, left wing front gauge wheel hydraulic cylinder three way solenoid valves  434 A and  434 C are energized, thereby bypassing left wing front gauge wheel hydraulic cylinders  442 A and  442 B, and actuating remaining left wing front gauge wheel hydraulic cylinders  442 C and  442 D. If it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  442 A,  442 B, and  442 C, left wing front gauge wheel hydraulic cylinder three way solenoid valves  434 A and  434 D are energized, thereby bypassing left wing front gauge wheel hydraulic cylinders  442 A,  442 B, and  442 C, and actuating remaining left wing front gauge wheel hydraulic cylinder  442 D. 
         [0088]    Similarly, the right wing rear lift wheel hydraulic subsystem  406  has at least one right wing rear lift wheel hydraulic cylinder  444 , four being illustrated in the embodiment of the tillage implement hydraulic system  400  shown in  FIG. 12 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 . Right wing rear lift wheel hydraulic cylinder  444 A may correspond to a right hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Right wing rear lift wheel hydraulic cylinders  444 B,  444 C, and  444 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on right inner wing section  14 B, right middle wing section  16 B, and right outer wing section  18 B, respectively, shown in  FIG. 1 . Right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0089]    The first right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 A shown in  FIG. 12  is configured to normally apply hydraulic flow and pressure received from the first pilot operated check valve  424  to the right wing rear lift wheel hydraulic cylinder  444 A, and upon energization to divert the hydraulic flow and pressure to a right wing rear lift wheel bypass valve  448 A. Each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 B,  436 C,  436 D is configured to normally apply hydraulic flow and pressure received from the previous right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, respectively, to its own right wing rear lift wheel hydraulic cylinders  444 B,  444 C,  444 D, respectively. Upon energization, each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 B,  436 C,  436 D is configured to apply hydraulic flow and pressure received from right wing rear lift wheel bypass valve  448 A via respective right wing rear lift wheel bypass valve  448 B,  448 C,  448 D, respectively, to its own right wing rear lift wheel hydraulic cylinders  444 B,  444 C,  444 D, respectively. 
         [0090]    In this way, the actuation of the right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D may be coordinated by leaving the right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A,  436 B,  436 C, and  436 D de-energized so that displacement of each of right wing rear lift wheel hydraulic cylinders  444 A,  444 B, and  444 C forces hydraulic fluid into each of subsequent right wing rear lift wheel hydraulic cylinders  444 B,  444 C, and  444 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinder  444 A, right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A and  436 B are energized, along with right wing rear lift wheel bypass valves  448 A and  448 B, thereby bypassing right wing rear lift wheel hydraulic cylinder  444 A and actuating remaining right wing rear lift wheel hydraulic cylinders  444 B,  444 C, and  444 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  444 A and  444 B, right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A and  436 C are energized, along with right wing rear lift wheel bypass valves  448 A and  448 C, thereby bypassing right wing rear lift wheel hydraulic cylinders  444 A and  444 B and actuating remaining right wing rear lift wheel hydraulic cylinders  444 C and  444 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  444 A,  444 B, and  444 C, right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A and  436 D are energized, along with right wing rear lift wheel bypass valves  448 A and  448 D, thereby bypassing right wing rear lift wheel hydraulic cylinders  444 A,  444 B, and  444 C, and actuating remaining right wing rear lift wheel hydraulic cylinder  444 D. Additionally, the right wing rear lift wheel bypass valves  448 A,  448 B,  448 C, and  448 D may assist in limiting leakage from right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A,  436 B,  436 C, and  436 D. 
         [0091]    Similarly, the left wing rear lift wheel hydraulic subsystem  408  has at least one left wing rear lift wheel hydraulic cylinder  446 , four being illustrated in the embodiment of the tillage implement hydraulic system  400  shown in  FIG. 12 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 . Left wing rear lift wheel hydraulic cylinder  446 A may correspond to a left hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Left wing rear lift wheel hydraulic cylinders  446 B,  446 C, and  446 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on left inner wing section  14 A, left middle wing section  16 A, and left outer wing section  18 A, respectively, shown in  FIG. 1 . Left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0092]    The first left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 A shown in  FIG. 12  is configured to normally apply hydraulic flow and pressure received from the second pilot operated check valve  426  to the left wing rear lift wheel hydraulic cylinder  446 A, and upon energization to divert the hydraulic flow and pressure to a left wing rear lift wheel bypass valve  450 A. Each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 B,  438 C,  438 D is configured to normally apply hydraulic flow and pressure received from the previous left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, respectively, to its own left wing rear lift wheel hydraulic cylinders  446 B,  446 C,  446 D, respectively. Upon energization, each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 B,  438 C,  438 D is configured to apply hydraulic flow and pressure received from left wing rear lift wheel bypass valve  450 A via respective left wing rear lift wheel bypass valve  450 B,  450 C,  450 D, respectively, to its own left wing rear lift wheel hydraulic cylinders  446 B,  446 C,  446 D, respectively. 
         [0093]    In this way, the actuation of the left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D may be coordinated by leaving the left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A,  438 B,  438 C, and  438 D de-energized so that displacement of each of left wing rear lift wheel hydraulic cylinders  446 A,  446 B, and  446 C forces hydraulic fluid into each of subsequent left wing rear lift wheel hydraulic cylinders  446 B,  446 C, and  446 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinder  446 A, left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A and  438 B are energized, along with left wing rear lift wheel bypass valves  450 A and  450 B, thereby bypassing left wing rear lift wheel hydraulic cylinder  446 A and actuating remaining left wing rear lift wheel hydraulic cylinders  446 B,  446 C, and  446 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  446 A and  446 B, left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A and  438 C are energized, along with left wing rear lift wheel bypass valves  450 A and  450 C, thereby bypassing left wing rear lift wheel hydraulic cylinders  446 A and  446 B and actuating remaining left wing rear lift wheel hydraulic cylinders  446 C and  446 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  446 A,  446 B, and  446 C, left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A and  438 D are energized, along with left wing rear lift wheel bypass valves  450 A and  450 D, thereby bypassing left wing rear lift wheel hydraulic cylinders  446 A,  446 B, and  446 C, and actuating remaining left wing rear lift wheel hydraulic cylinder  446 D. 
         [0094]    Subsequent to right wing front gauge wheel hydraulic cylinder  440 D, left wing front gauge wheel hydraulic cylinder  442 D, right wing rear lift wheel hydraulic cylinder  444 D, and left wing rear lift wheel hydraulic cylinder  446 D, the hydraulic flow returns from tillage implement hydraulic system  400  via a second solenoid operated normally closed directional control check valve with manual override  456 , which may be within manifold  458 . 
         [0095]    Each of the first solenoid operated normally closed directional control check valve with manual override  410 , the first solenoid operated normally closed two way poppet bypass valve  414 , the second solenoid operated normally closed two way poppet bypass valve  418 , the third solenoid operated normally closed two way poppet bypass valve  422 , the right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A,  432 B,  432 C, and  432 D, the left wing front gauge hydraulic cylinder three way solenoid valves  434 A,  434 B,  434 C, and  434 D, the right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A,  436 B,  436 C, and  436 D, the left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A,  438 B,  438 C, and  438 D, the right wing rear lift wheel bypass valves  448 A,  448 B,  448 C, and  448 D, the left wing rear lift wheel bypass valves  450 A,  450 B,  450 C, and  450 D, and the second solenoid operated normally closed directional control check valve with manual override  456  may be connected to a controller  460 . 
         [0096]    The controller  460  may be operable to selectively coordinate the hydraulic cylinders of the right wing front gauge wheel hydraulic subsystem  402 , the left wing front gauge wheel hydraulic subsystem  404 , the right wing rear lift wheel hydraulic subsystem  406 , and the left wing rear lift wheel hydraulic subsystem  408  using the first solenoid operated normally closed two way poppet bypass valve  414 , the second solenoid operated normally closed two way poppet bypass valve  418 , and the third solenoid operated normally closed two way poppet bypass valve  422 , to function as described previously. 
         [0097]    The controller  460  may further be operable to selectively coordinate the right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, and  440 D using the right wing front gauge wheel hydraulic cylinder three way solenoid valves  432 A,  432 B,  432 C, and  432 D, as described previously. The controller  460  may further be operable to selectively coordinate the left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D using the left wing front gauge hydraulic cylinder three way solenoid valves  434 A,  434 B,  434 C, and  434 D, as described previously. The controller  460  may further be operable to selectively coordinate the right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D using the right wing rear lift wheel hydraulic cylinder three way solenoid valves  436 A,  436 B,  436 C, and  436 D, and the right wing rear lift wheel bypass valves  448 A,  448 B,  448 C, and  448 D, as described previously. The controller  460  may further be operable to selectively coordinate the left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D using the left wing rear lift wheel hydraulic cylinder three way solenoid valves  438 A,  438 B,  438 C, and  438 D, and the left wing rear lift wheel bypass valves  450 A,  450 B,  450 C, and  450 D, as described previously. 
         [0098]    Each of the right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, and  440 D may be provided with a right wing front gauge wheel hydraulic cylinder displacement detecting device  462 A,  462 B,  462 C, and  462 D, respectively. The right wing front gauge wheel hydraulic cylinder displacement detecting devices  462 A,  462 B,  462 C, and  462 D may each be connected to the controller  460  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C,  440 D. Each of the left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D may be provided with a left wing front gauge wheel hydraulic cylinder displacement detecting device  464 A,  464 B,  464 C, and  464 D, respectively. The left wing front gauge wheel hydraulic cylinder displacement detecting devices  464 A,  464 B,  464 C, and  464 D may each be connected to the controller  460  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D. 
         [0099]    Each of the right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D may be provided with a right wing rear lift wheel hydraulic cylinder displacement detecting device  466 A,  466 B,  466 C, and  466 D, respectively. The right wing rear lift wheel hydraulic cylinder displacement detecting devices  466 A,  466 B,  466 C, and  466 D may each be connected to the controller  460  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D. Each of the left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D may be provided with a left wing rear lift wheel hydraulic cylinder displacement detecting device  468 A,  468 B,  468 C, and  468 D, respectively. The left wing rear lift wheel hydraulic cylinder displacement detecting device  468 A,  468 B,  468 C, and  468 D may each be connected to the controller  460  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D. 
         [0100]    A rheostat type of sensor is shown in  FIG. 12 , although any kind of sensor producing an output proportional to sensed displacement and/or rate of change of displacement may be used. The controller  460  may again calibrate the right wing front gauge wheel hydraulic cylinders  440 A,  440 B,  440 C, and  440 D, the left wing front gauge wheel hydraulic cylinders  442 A,  442 B,  442 C, and  442 D, the right wing rear lift wheel hydraulic cylinders  444 A,  444 B,  444 C, and  444 D, and the left wing rear lift wheel hydraulic cylinders  446 A,  446 B,  446 C, and  446 D by first extending each to its maximum length, similar to the controller  360  in  FIG. 11 . Individual readings are then taken from the hydraulic cylinder displacement detecting devices  462 A,  462 B,  462 C,  462 D,  464 A,  464 B,  464 C,  464 D,  466 A,  466 B,  466 C,  466 D,  468 A,  468 B,  468 C, and  468 D. The agricultural tillage implement  10  is then lowered so that the tools, in this embodiment the cultivator shanks  36 , just touch the level surface. Once this condition is achieved, individual readings are again taken from the hydraulic cylinder displacement detecting devices  462 A,  462 B,  462 C,  462 D,  464 A,  464 B,  464 C,  464 D,  466 A,  466 B,  466 C,  466 D,  468 A,  468 B,  468 C, and  468 D. These displacement signals may then be stored in the controller  460 , and provide the synchronized set point for the displacement detecting devices  462 A,  462 B,  462 C,  462 D,  464 A,  464 B,  464 C,  464 D,  466 A,  466 B,  466 C,  466 D,  468 A,  468 B,  468 C, and  468 D. 
         [0101]    As with the controller  360 , the controller  460  may periodically during the operation of the agricultural tillage implement  10 , take the readings of the hydraulic cylinder displacement detecting devices  462 A,  462 B,  462 C,  462 D,  464 A,  464 B,  464 C,  464 D,  466 A,  466 B,  466 C,  466 D,  468 A,  468 B,  468 C, and  468 D and, if they deviate from the set point initially established, the controller  460  corrects the appropriate hydraulic cylinder  440 A,  440 B,  440 C,  440 D,  442 A,  442 B,  442 C,  442 D,  444 A,  444 B,  444 C,  444 D,  446 A,  446 B,  446 C, or  446 D to achieve the intended set point. This may be done independently of other hydraulic cylinders using the methods described previously. The agricultural tillage implement  10  is then able to provide accurate depth of penetration of the tools, in this embodiment the cultivator shanks  36 . 
         [0102]    Turning now to  FIG. 13 , a schematic illustration of a tillage implement hydraulic system  500  upon which an embodiment of the present invention may be used, along with being used with tillage implement hydraulic systems  700 ,  800 ,  600  or  900 , and  300  or  400 , is shown. The tillage implement hydraulic system  500  includes a right wing front gauge wheel hydraulic subsystem  502 , a left wing front gauge wheel hydraulic subsystem  504 , a right wing rear lift wheel hydraulic subsystem  506 , and a left wing rear lift wheel hydraulic subsystem  508 . Hydraulic pressure and flow is admitted to the tillage implement hydraulic system  500 , whereupon the hydraulic pressure and flow proceeds to a first hydraulic flow divider and combiner  512 , which splits the hydraulic flow between the rear lift wheel hydraulic subsystems  506 ,  508 , and the front gauge wheel hydraulic subsystems  502 ,  504 , respectively. A first solenoid operated normally closed two way poppet bypass valve  514  interconnects the hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  506 ,  508 , and to the gauge wheel hydraulic subsystems  502 ,  504 , subsequent to its division by the first hydraulic flow divider and combiner  512 , which first solenoid operated normally closed two way poppet bypass valve  514  may selectively rejoin the flow proceeding from the first hydraulic flow divider and combiner  512  for use in one or the other of the rear lift wheel hydraulic subsystems  506 ,  508 , or the front gauge wheel hydraulic subsystems  502 ,  504 , according to need. In this way, actuation of hydraulic cylinders within the rear lift wheel hydraulic subsystems  506 ,  508 , and within the front gauge wheel hydraulic subsystems  502 ,  504  may be accomplished in coordinated fashion by use of the first hydraulic flow divider and combiner  512 , or may be accomplished selectively by rejoining the flow proceeding from the first hydraulic flow divider and combiner  512  using the first solenoid operated normally closed two way poppet bypass valve  514 , and then selectively actuating one or more of first solenoid operated normally closed two way poppet valve  524 , second solenoid operated normally closed two way poppet valve  526 , third solenoid operated normally closed two way poppet valve  528 , or fourth solenoid operated normally closed two way poppet valve  530 . 
         [0103]    The hydraulic flow proceeding to the rear lift wheel hydraulic subsystems  506 ,  508 , is then further split in a second hydraulic flow divider and combiner  516 , which splits the hydraulic flow between the right wing rear lift wheel hydraulic subsystem  506  and the left wing rear lift wheel hydraulic subsystem  508 . A second solenoid operated normally closed two way poppet bypass valve  518  interconnects the hydraulic flow proceeding to the right wing rear lift wheel hydraulic subsystem  506  and to the left wing rear lift wheel hydraulic subsystem  508 , subsequent to its division by the second hydraulic flow divider and combiner  516 , which second solenoid operated normally closed two way poppet bypass valve  518  may selectively rejoin the flow proceeding from the second hydraulic flow divider and combiner  516  for use in one or the other of the right wing rear lift wheel hydraulic subsystem  506  or the left wing rear lift wheel hydraulic subsystem  508 , according to need. In this way, actuation of hydraulic cylinders within the right wing rear lift wheel hydraulic subsystem  506  and within the left wing rear lift wheel hydraulic subsystem  508  may be accomplished in coordinated fashion by use of the second hydraulic flow divider and combiner  516 , or may be accomplished selectively by rejoining the flow proceeding from the second hydraulic flow divider and combiner  516  using the second solenoid operated normally closed two way poppet bypass valve  518 , and then selectively actuating one or more of first solenoid operated normally closed two way poppet valve  524  or second solenoid operated normally closed two way poppet valve  526 . 
         [0104]    The hydraulic flow proceeding to the front gauge wheel hydraulic subsystems  502 ,  504 , is then further split in a third hydraulic flow divider and combiner  520 , which splits the hydraulic flow between the right wing front gauge wheel hydraulic subsystem  502  and the left wing front gauge wheel hydraulic subsystem  504 . A third solenoid operated normally closed two way poppet bypass valve  522  interconnects the hydraulic flow proceeding to the right wing front gauge wheel hydraulic subsystem  502  and the left wing front gauge wheel hydraulic subsystem  504 , subsequent to its division by the third hydraulic flow divider and combiner  520 , which third solenoid operated normally closed two way poppet bypass valve  522  may selectively rejoin the flow proceeding from the third hydraulic flow divider and combiner  520  for use in one or the other of the right wing front gauge wheel hydraulic subsystem  502  or the left wing front gauge wheel hydraulic subsystem  504 , according to need. In this way, actuation of hydraulic cylinders within the right wing front gauge wheel hydraulic subsystem  502  and within the right wing front gauge wheel hydraulic subsystem  504  may be accomplished in coordinated fashion by use of the third hydraulic flow divider and combiner  520 , or may be accomplished selectively by rejoining the flow proceeding from the third hydraulic flow divider and combiner  520  using the third solenoid operated normally closed two way poppet bypass valve  522 , and then selectively actuating one or more of third solenoid operated normally closed two way poppet valve  528  or fourth solenoid operated normally closed two way poppet valve  530 . 
         [0105]    Hydraulic flow and pressure proceeding from the second hydraulic flow divider and combiner  516  and/or the second solenoid operated normally closed two way poppet bypass valve  518  then passes through a first solenoid operated normally closed two way poppet valve  524  or a second solenoid operated normally closed two way poppet valve  526  before proceeding to the right wing rear lift wheel hydraulic subsystem  506  or to the left wing rear lift wheel hydraulic subsystem  508 , respectively. Hydraulic flow and pressure proceeding from the third hydraulic flow divider and combiner  520  and/or the third solenoid operated normally closed two way poppet bypass valve  522  then passes through a third solenoid operated normally closed two way poppet valve  528  or a fourth solenoid operated normally closed two way poppet bypass valve  530  before proceeding to the right wing front gauge wheel hydraulic subsystem  502  or the left wing front gauge wheel hydraulic subsystem  504 , respectively. 
         [0106]    Each of the first hydraulic flow divider and combiner  512 , the first solenoid operated normally closed two way poppet bypass valve  514 , the second hydraulic flow divider and combiner  516 , the second solenoid operated normally closed two way poppet bypass valve  518 , the third hydraulic flow divider and combiner  520 , and the third solenoid operated normally closed two way poppet bypass valve  522  may be contained within a manifold  558 . 
         [0107]    The right wing front gauge wheel hydraulic subsystem  502  has at least one right wing front gauge wheel hydraulic cylinder  540 , four being illustrated in the embodiment of the tillage implement hydraulic system  500  shown in  FIG. 13 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 . Right wing front gauge wheel hydraulic cylinder  540 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward right corner of the main shank frame  28  shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  540 B,  540 C, and  540 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F, respectively, shown in  FIG. 1 . Right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, and  540 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0108]    The first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A shown in  FIG. 13  is configured to normally apply hydraulic flow and pressure received from the third solenoid operated normally closed two way poppet valve  528  to the right wing front gauge wheel hydraulic cylinder  540 A, and upon energization to divert the hydraulic flow and pressure to a right wing front gauge wheel bypass circuit  552 . Each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valve  532 B,  532 C,  532 D is configured to normally apply hydraulic flow and pressure received from the previous right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, respectively, to its own right wing front gauge wheel hydraulic cylinder  540 B,  540 C,  540 D, respectively. Upon energization, each of the subsequent right wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  532 B,  532 C,  532 D is configured to apply hydraulic flow and pressure received from right wing front gauge wheel bypass circuit  552  to its own right wing front gauge wheel hydraulic cylinder  540 B,  540 C,  540 D, respectively. 
         [0109]    In this way, the actuation of the right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, and  540 D may be coordinated by leaving the right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A,  532 B,  532 C, and  532 D de-energized so that displacement of each of right wing front gauge wheel hydraulic cylinders  540 A,  540 B, and  540 C forces hydraulic fluid into each of subsequent right wing front gauge wheel hydraulic cylinders  540 B,  540 C, and  540 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinder  540 B, right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A and  532 B are energized, thereby bypassing right wing front gauge wheel hydraulic cylinder  540 A and actuating remaining right wing front gauge wheel hydraulic cylinders  540 B,  540 C, and  540 D. Similarly, if it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  540 A and  540 B, right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A and  532 C are energized, thereby bypassing right wing front gauge wheel hydraulic cylinders  540 A and  540 B, and actuating remaining right wing front gauge wheel hydraulic cylinders  540 C and  540 D. If it is desired to bypass adjustment of right wing front gauge wheel hydraulic cylinders  540 A,  540 B, and  540 C, right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A and  532 D are energized, thereby bypassing right wing front gauge wheel hydraulic cylinders  540 A,  540 B, and  540 C, and actuating remaining right wing front gauge wheel hydraulic cylinder  540 D. 
         [0110]    Similarly, the left wing front gauge wheel hydraulic subsystem  504  has at least one left wing front gauge wheel hydraulic cylinder  542 , four being illustrated in the embodiment of the tillage implement hydraulic system  500  shown in  FIG. 13 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 . Left wing front gauge wheel hydraulic cylinder  542 A may correspond to hydraulic cylinder  62  actuating the gauge wheel assembly  56  on the forward left corner of the main shank frame  28  shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  542 B,  542 C, and  542 D may correspond to hydraulic cylinders  64  actuating the gauge wheel assemblies  70  on left inner wing front shank frame  66 A, left middle wing front shank frame  66 C, and left outer wing front shank frame  66 E, respectively, shown in  FIG. 1 . Left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D are used to control the depth of the cultivator shanks  36  on the main shank frame  28 , right inner wing front shank frame  66 B, right middle wing front shank frame  66 D, and right outer wing front shank frame  66 F. 
         [0111]    The first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A shown in  FIG. 13  is configured to normally apply hydraulic flow and pressure received from the fourth solenoid operated normally closed two way poppet valve  530  to the left wing front gauge wheel hydraulic cylinder  542 A, and upon energization to divert the hydraulic flow and pressure to a left wing front gauge wheel bypass circuit  554 . Each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  534 B,  534 C,  534 D is configured to normally apply hydraulic flow and pressure received from the previous left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, respectively, to its own left wing front gauge wheel hydraulic cylinder  542 B,  542 C,  542 D, respectively. Upon energization, each of the subsequent left wing front gauge wheel hydraulic cylinder three way solenoid valves with internal check valves  534 B,  534 C,  534 D is configured to apply hydraulic flow and pressure received from left wing front gauge wheel bypass circuit  554  to its own left wing front gauge wheel hydraulic cylinder  542 B,  542 C,  542 D, respectively. 
         [0112]    In this way, the actuation of the left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D may be coordinated by leaving the left wing front gauge wheel hydraulic cylinder three way solenoid valves  534 A,  534 B,  534 C, and  534 D de-energized so that displacement of each of left wing front gauge wheel hydraulic cylinders  542 A,  542 B, and  542 C forces hydraulic fluid into each of subsequent left wing front gauge wheel hydraulic cylinders  542 B,  542 C, and  542 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinder  542 A, left wing front gauge wheel hydraulic cylinder three way solenoid valves  534 A and  534 B are energized, thereby bypassing left wing front gauge wheel hydraulic cylinder  542 A and actuating remaining left wing front gauge wheel hydraulic cylinders  542 B,  542 C, and  542 D. Similarly, if it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  542 A and  542 B, left wing front gauge wheel hydraulic cylinder three way solenoid valves  534 A and  534 C are energized, thereby bypassing left wing front gauge wheel hydraulic cylinders  542 A and  542 B, and actuating remaining left wing front gauge wheel hydraulic cylinders  542 C and  542 D. If it is desired to bypass adjustment of left wing front gauge wheel hydraulic cylinders  542 A,  542 B, and  542 C, left wing front gauge wheel hydraulic cylinder three way solenoid valves  534 A and  534 D are energized, thereby bypassing left wing front gauge wheel hydraulic cylinders  542 A,  542 B, and  542 C, and actuating remaining left wing front gauge wheel hydraulic cylinder  542 D. 
         [0113]    Similarly, the right wing rear lift wheel hydraulic subsystem  506  has at least one right wing rear lift wheel hydraulic cylinder  544 , four being illustrated in the embodiment of the tillage implement hydraulic system  500  shown in  FIG. 13 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 . Right wing rear lift wheel hydraulic cylinder  544 A may correspond to a right hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Right wing rear lift wheel hydraulic cylinders  544 B,  544 C, and  544 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on right inner wing section  14 B, right middle wing section  16 B, and right outer wing section  18 B, respectively, shown in  FIG. 1 . Right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0114]    The first right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 A shown in  FIG. 13  is configured to normally apply hydraulic flow and pressure received from the first solenoid operated normally closed two way poppet valve  524  to the right wing rear lift wheel hydraulic cylinder  544 A, and upon energization to divert the hydraulic flow and pressure to a right wing rear lift wheel bypass circuit  560 . Each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 B,  536 C,  536 D is configured to normally apply hydraulic flow and pressure received from the previous right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, respectively, to its own right wing rear lift wheel hydraulic cylinders  544 B,  544 C,  544 D, respectively. Upon energization, each of the subsequent right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 B,  536 C,  536 D is configured to apply hydraulic flow and pressure received from right wing rear lift wheel bypass circuit  560  via respective right wing rear lift wheel bypass valve  548 A,  548 B,  548 C, respectively, to its own right wing rear lift wheel hydraulic cylinders  544 B,  544 C,  544 D, respectively. 
         [0115]    In this way, the actuation of the right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D may be coordinated by leaving the right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A,  536 B,  536 C, and  536 D de-energized so that displacement of each of right wing rear lift wheel hydraulic cylinders  544 A,  544 B, and  544 C forces hydraulic fluid into each of subsequent right wing rear lift wheel hydraulic cylinders  544 B,  544 C, and  544 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinder  544 A, right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A and  536 B are energized, along with right wing rear lift wheel bypass valve  548 A, thereby bypassing right wing rear lift wheel hydraulic cylinder  544 A and actuating remaining right wing rear lift wheel hydraulic cylinders  544 B,  544 C, and  544 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  544 A and  544 B, right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A and  536 C are energized, along with right wing rear lift wheel bypass valve  548 B, thereby bypassing right wing rear lift wheel hydraulic cylinders  544 A and  544 B and actuating remaining right wing rear lift wheel hydraulic cylinders  544 C and  544 D. Similarly if it is desired to bypass adjustment of right wing rear lift wheel hydraulic cylinders  544 A,  544 B, and  544 C, right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A and  536 D are energized, along with right wing rear lift wheel bypass valve  548 C, thereby bypassing right wing rear lift wheel hydraulic cylinders  544 A,  544 B, and  544 C, and actuating remaining right wing rear lift wheel hydraulic cylinder  544 D. 
         [0116]    Similarly, the left wing rear lift wheel hydraulic subsystem  508  has at least one left wing rear lift wheel hydraulic cylinder  546 , four being illustrated in the embodiment of the tillage implement hydraulic system  500  shown in  FIG. 13 , as a non-limiting example, each of which is selectively supplied with hydraulic flow and pressure using a left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 . Left wing rear lift wheel hydraulic cylinder  546 A may correspond to a left hand hydraulic cylinder  54  actuating the rear lift wheels  52  on an embodiment wherein there are at least two such hydraulic cylinders  54  actuating the rear lift wheels  52  independently. Left wing rear lift wheel hydraulic cylinders  546 B,  546 C, and  546 D may correspond to hydraulic cylinders  60  actuating wing lift wheels  53  on left inner wing section  14 A, left middle wing section  16 A, and left outer wing section  18 A, respectively, shown in  FIG. 1 . Left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, and  546 D are used to control the depth of the cultivator shanks  36  attached to the rear auxiliary implements  30  and  78 . 
         [0117]    The first left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 A shown in  FIG. 13  is configured to normally apply hydraulic flow and pressure received from the second solenoid operated normally closed two way poppet valve  526  to the left wing rear lift wheel hydraulic cylinder  546 A, and upon energization to divert the hydraulic flow and pressure to a left wing rear lift wheel bypass circuit  562 . Each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 B,  538 C,  538 D is configured to normally apply hydraulic flow and pressure received from the previous left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, respectively, to its own left wing rear lift wheel hydraulic cylinders  546 B,  546 C,  546 D, respectively. Upon energization, each of the subsequent left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 B,  538 C,  538 D is configured to apply hydraulic flow and pressure received from left wing rear lift wheel bypass circuit  562  via respective left wing rear lift wheel bypass valve  550 A,  550 B,  550 B, respectively, to its own left wing rear lift wheel hydraulic cylinders  546 B,  546 C,  546 D, respectively. 
         [0118]    In this way, the actuation of the left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, and  546 D may be coordinated by leaving the left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A,  538 B,  538 C, and  538 D de-energized so that displacement of each of left wing rear lift wheel hydraulic cylinders  546 A,  546 B, and  546 C forces hydraulic fluid into each of subsequent left wing rear lift wheel hydraulic cylinders  546 B,  546 C, and  546 D, respectively, resulting in coordinated motion. When it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinder  546 A, left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A and  538 B are energized, along with left wing rear lift wheel bypass valve  550 A, thereby bypassing left wing rear lift wheel hydraulic cylinder  546 A and actuating remaining left wing rear lift wheel hydraulic cylinders  546 B,  546 C, and  546 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  546 A and  546 B, left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A and  538 C are energized, along with left wing rear lift wheel bypass valves  550 B, thereby bypassing left wing rear lift wheel hydraulic cylinders  546 A and  546 B and actuating remaining left wing rear lift wheel hydraulic cylinders  546 C and  546 D. Similarly, if it is desired to bypass adjustment of left wing rear lift wheel hydraulic cylinders  546 A,  546 B, and  546 C, left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A and  538 D are energized, along with left wing rear lift wheel bypass valve  550 C, thereby bypassing left wing rear lift wheel hydraulic cylinders  546 A,  546 B, and  546 C, and actuating remaining left wing rear lift wheel hydraulic cylinder  546 D. 
         [0119]    Subsequent to right wing front gauge wheel hydraulic cylinder  540 D, left wing front gauge wheel hydraulic cylinder  542 D, right wing rear lift wheel hydraulic cylinder  544 D, and left wing rear lift wheel hydraulic cylinder  546 D, the hydraulic flow returns from tillage implement hydraulic system  500  via manifold  558 . 
         [0120]    Each of the first solenoid operated normally closed two way poppet bypass valve  514 , the second solenoid operated normally closed two way poppet bypass valve  518 , the third solenoid operated normally closed two way poppet bypass valve  522 , the first solenoid operated normally closed two way poppet valve  524 , the second solenoid operated normally closed two way poppet valve  526 , the third solenoid operated normally closed two way poppet valve  528 , and the fourth solenoid operated normally closed two way poppet valve  530 , the right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A,  532 B,  532 C, and  532 D, the left wing front gauge hydraulic cylinder three way solenoid valves  534 A,  534 B,  534 C, and  534 D, the right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A,  536 B,  536 C, and  536 D, the left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A,  538 B,  538 C, and  538 D, the right wing rear lift wheel bypass valves  548 A,  548 B, and  548 C, and the left wing rear lift wheel bypass valves  550 A,  550 B, and  550 C, may be connected to a controller  564 . 
         [0121]    The controller  564  may be operable to selectively coordinate the hydraulic cylinders of the right wing front gauge wheel hydraulic subsystem  502 , the left wing front gauge wheel hydraulic subsystem  504 , the right wing rear lift wheel hydraulic subsystem  506 , and the left wing rear lift wheel hydraulic subsystem  508  using the first solenoid operated normally closed two way poppet bypass valve  514 , the second solenoid operated normally closed two way poppet bypass valve  518 , the third solenoid operated normally closed two way poppet bypass valve  522 , the first solenoid operated normally closed two way poppet valve  524 , the second solenoid operated normally closed two way poppet valve  526 , the third solenoid operated normally closed two way poppet valve  528 , and the fourth solenoid operated normally closed two way poppet valve  530 , to function as described previously. 
         [0122]    The controller  564  may further be operable to selectively coordinate the right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, and  540 D using the right wing front gauge wheel hydraulic cylinder three way solenoid valves  532 A,  532 B,  532 C, and  532 D, as described previously. The controller  564  may further be operable to selectively coordinate the left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D using the left wing front gauge hydraulic cylinder three way solenoid valves  534 A,  534 B,  534 C, and  534 D, as described previously. The controller  564  may further be operable to selectively coordinate the right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D using the right wing rear lift wheel hydraulic cylinder three way solenoid valves  536 A,  536 B,  536 C, and  536 D, and the right wing rear lift wheel bypass valves  548 A,  548 B, and  548 C, as described previously. The controller  564  may further be operable to selectively coordinate the left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, and  546 D using the left wing rear lift wheel hydraulic cylinder three way solenoid valves  538 A,  538 B,  538 C, and  538 D, and the left wing rear lift wheel bypass valves  550 A,  550 B, and  550 C, as described previously. 
         [0123]    Each of the right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, and  540 D may be provided with a right wing front gauge wheel hydraulic cylinder displacement detecting device  566 A,  566 B,  566 C, and  566 D, respectively. The right wing front gauge wheel hydraulic cylinder displacement detecting devices  566 A,  566 B,  566 C, and  566 D may each be connected to the controller  564  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C,  540 D. Each of the left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D may be provided with a left wing front gauge wheel hydraulic cylinder displacement detecting device  568 A,  568 B,  568 C, and  568 D, respectively. The left wing front gauge wheel hydraulic cylinder displacement detecting devices  568 A,  568 B,  568 C, and  568 D may each be connected to the controller  564  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D. 
         [0124]    Each of the right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D may be provided with a right wing rear lift wheel hydraulic cylinder displacement detecting device  570 A,  570 B,  570 C, and  570 D, respectively. The right wing rear lift wheel hydraulic cylinder displacement detecting devices  570 A,  570 B,  570 C, and  570 D may each be connected to the controller  564  (connection not shown for simplicity), and provide signals proportional to the displacement of the right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D. Each of the left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  456 C, and  456 D may be provided with a left wing rear lift wheel hydraulic cylinder displacement detecting device  572 A,  572 B,  572 C, and  572 D, respectively. The left wing rear lift wheel hydraulic cylinder displacement detecting device  572 A,  572 B,  572 C, and  572 D may each be connected to the controller  564  (connection not shown for simplicity), and provide signals proportional to the displacement of the left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, and  546 D. 
         [0125]    A rheostat type of sensor is shown in  FIG. 13 , although any kind of sensor producing an output proportional to sensed displacement and/or rate of change of displacement may be used. The controller  564  may again calibrate the right wing front gauge wheel hydraulic cylinders  540 A,  540 B,  540 C, and  540 D, the left wing front gauge wheel hydraulic cylinders  542 A,  542 B,  542 C, and  542 D, the right wing rear lift wheel hydraulic cylinders  544 A,  544 B,  544 C, and  544 D, and the left wing rear lift wheel hydraulic cylinders  546 A,  546 B,  546 C, and  546 D by first extending each to its maximum length, similar to the controllers  360  and  460  in  FIGS. 11 and 12 . Individual readings are then taken from the hydraulic cylinder displacement detecting devices  566 A,  566 B,  566 C,  566 D,  568 A,  568 B,  568 C,  568 D,  570 A,  570 B,  570 C,  570 D,  572 A,  572 B,  572 C, and  572 D. The agricultural tillage implement  10  is then lowered so that the tools, in this embodiment the cultivator shanks  36 , just touch the level surface. Once this condition is achieved, individual readings are again taken from the hydraulic cylinder displacement detecting devices  566 A,  566 B,  566 C,  566 D,  568 A,  568 B,  568 C,  568 D,  570 A,  570 B,  570 C,  570 D,  572 A,  572 B,  572 C, and  572 D. These displacement signals may then be stored in the controller  564 , and provide the synchronized set point for the displacement detecting devices  566 A,  566 B,  566 C,  566 D,  568 A,  568 B,  568 C,  568 D,  570 A,  570 B,  570 C,  570 D,  572 A,  572 B,  572 C, and  572 D. 
         [0126]    As with the controllers  360  and  460 , the controller  564  may periodically during the operation of the agricultural tillage implement  10 , take the readings of the hydraulic cylinder displacement detecting devices  566 A,  566 B,  566 C,  566 D,  568 A,  568 B,  568 C,  568 D,  570 A,  570 B,  570 C,  570 D,  572 A,  572 B,  572 C, and  572 D and, if they deviate from the set point initially established, the controller  564  corrects the appropriate hydraulic cylinder  540 A,  540 B,  540 C,  540 D,  542 A,  542 B,  542 C,  542 D,  544 A,  544 B,  544 C,  544 D,  546 A,  546 B,  546 C, or  546 D to achieve the intended set point. This may be done independently of other hydraulic cylinders using the methods described previously. The agricultural tillage implement  10  is then able to provide accurate depth of penetration of the tools, in this embodiment the cultivator shanks  36 . 
         [0127]    Turning now to  FIG. 14 , a system or method according to an embodiment of the present invention includes a series of steps of activating certain valves, pressurizing or depressurizing certain hydraulic circuits, and/or actuating certain hydraulic cylinders of tillage implement hydraulic systems  700 ,  800 ,  600  or  900 , and  300 ,  400 , or  500 , in order to bleed air from these hydraulic systems under the control of controllers  946 ,  654 ,  828 ,  360 ,  460 , and/or  564  is shown. Controllers  946 ,  654 ,  828 ,  360 ,  460 , and/or  564  may be part of a single implement controller, or may be separate individual controllers operating cooperatively. Software within these controllers, or within the single implement controller, may prompt an operator to select by way of an in-cab screen a series of individual steps by which the process of bleeding air from the hydraulic systems proceeds from step to step. That is to say, the implement controller or controllers may indicate which valves should be activated or deactivated, which hydraulic circuits should be pressurized or depressurized, and/or which hydraulic cylinders should be actuated in which direction, in the proper sequence in order to successfully and efficiently bleed the air from the hydraulic systems. Alternatively, the implement controller or controllers may perform the steps in sequence upon the operator selecting a single “purge” function. Still alternately, the implement controller or controllers may prompt the operator to authorize a group of steps to be taken, according to the section of the implement hydraulic system to be involved. This allows the operator to avoid activating or deactivating the wrong valves, pressurizing or depressurizing the wrong hydraulic circuits, or actuating the wrong hydraulic cylinders at the wrong time during the process of bleeding air from the hydraulic systems, and ensures a consistent bleed sequence every time the process is performed. 
         [0128]    As a non-limiting example, the computer controlled hydraulic bleed sequence may involve the following steps:
       In a first step  1000 , raise the agricultural tillage implement  10  by extending each of the rear lift wheels  52 , the gauge wheel assemblies  56 , the toolbar lift wheels  53 , and the gauge wheel assemblies  70 , using the hydraulic cylinders  54 , the hydraulic cylinders  62 , the hydraulic cylinders  60 , and the hydraulic cylinders  64 , respectfully, until they expose their re-phasing ports. The re-phasing ports are ports in the cylinder that are exposed beyond a certain stroke, and operate to release hydraulic pressure in the cylinders beyond that point.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating the first solenoid operated normally closed directional control check valve with manual override  310 .   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating the first solenoid operated normally closed directional control check valve with manual override  410 .   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating the first solenoid operated normally closed two way poppet valve  524 , the second solenoid operated normally closed two way poppet valve  526 , the third solenoid operated normally closed two way poppet valve  528 , and the fourth solenoid operated normally closed two way poppet valve  530 .   
           In a second step  1002 , lower the agricultural tillage implement  10  by retracting each of the rear lift wheels  52 , the gauge wheel assemblies  56 , the toolbar lift wheels  53 , and the gauge wheel assemblies  70 , using the hydraulic cylinders  54 , the hydraulic cylinders  62 , the hydraulic cylinders  60 , and the hydraulic cylinders  64 , respectfully.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating the second solenoid operated normally closed directional control check valve with manual override  356 .   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating the second solenoid operated normally closed directional control check valve with manual override  456 .   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by reversing the hydraulic flow to the system and activating the first solenoid operated normally closed two way poppet valve  524 , the second solenoid operated normally closed two way poppet valve  526 , the third solenoid operated normally closed two way poppet valve  528 , and the fourth solenoid operated normally closed two way poppet valve  530 .   
           In a third step  1004 , begin purging the front gauge wheel bypass circuits of air.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating first solenoid operated normally closed directional control check valve with manual override  310 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A and first right wing front gauge wheel bypass valve  348 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A and first left wing front gauge wheel bypass valve  350 A, and first solenoid operated normally closed two way poppet bypass valve  314 .   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating first solenoid operated normally closed directional control check valve with manual override  410 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A, and first solenoid operated normally closed two way poppet bypass valve  414 .   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating first solenoid operated normally closed two way poppet bypass valve  514 , third solenoid operated normally closed two way poppet valve  528  and first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A, and fourth solenoid operated normally closed two way poppet valve  530  and first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A.   
           In a fourth step  1006 , begin purging the wing rear lift wheel bypass circuits between the hydraulic cylinders  54  of the rear lift wheels  52  and the hydraulic cylinders  60  of the inner set of toolbar lift wheels  53  of air while continuing to purge the front gauge wheel bypass circuits of air. In doing so, it is only necessary to extend these cylinders by two or three inches.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  310 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A and first right wing front gauge wheel bypass valve  348 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A and first left wing front gauge wheel bypass valve  350 A, first solenoid operated normally closed two way poppet bypass valve  314 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 A and first right wing rear lift wheel bypass valve  352 A, second right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 B and second right wing rear lift wheel bypass valve  352 B, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 A and first left wing rear lift wheel bypass valve  354 A, and second left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 B and second left wing rear lift wheel bypass valve  354 B   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  410 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A, first solenoid operated normally closed two way poppet bypass valve  414 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 A and first right wing rear lift wheel bypass valve  448 A, second right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 B and second right wing rear lift wheel bypass valve  448 B, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 A and first left wing rear lift wheel bypass valve  450 A, and second left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 B and second left wing rear lift wheel bypass valve  450 B.   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating or keeping active third solenoid operated normally closed two way poppet valve  528  and first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A, fourth solenoid operated normally closed two way poppet valve  530  and first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A, first solenoid operated normally closed two way poppet bypass valve  514 , first solenoid operated normally closed two way poppet valve  524  and first right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 A, second right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 B and first right wing rear lift wheel bypass valve  548 A, second solenoid operated normally closed two way poppet valve  526  and first left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 A, and second left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 B and first left wing rear lift wheel bypass valve  550 A   
           In a fifth step  1008 , purge the wing rear lift wheel bypass circuits between the hydraulic cylinders  54  of the rear lift wheels  52  and the hydraulic cylinders  60  of the middle set of toolbar lift wheels  53  of air while continuing to purge the front gauge wheel bypass circuits of air. Again, in doing so, it is only necessary to extend these cylinders by two or three inches.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  310 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A and first right wing front gauge wheel bypass valve  348 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A and first left wing front gauge wheel bypass valve  350 A, first solenoid operated normally closed two way poppet bypass valve  314 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 A and first right wing rear lift wheel bypass valve  352 A, third right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 C and third right wing rear lift wheel bypass valve  352 C, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 A and first left wing rear lift wheel bypass valve  354 A, and third left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 C and third left wing rear lift wheel bypass valve  354 C.   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  410 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A, first solenoid operated normally closed two way poppet bypass valve  414 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 A and first right wing rear lift wheel bypass valve  448 A, third right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 C and third right wing rear lift wheel bypass valve  448 C, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 A and first left wing rear lift wheel bypass valve  450 A, and third left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 C and third left wing rear lift wheel bypass valve  450 C   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating or keeping active third solenoid operated normally closed two way poppet valve  528  and first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A, fourth solenoid operated normally closed two way poppet valve  530  and first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A, first solenoid operated normally closed two way poppet bypass valve  514 , first solenoid operated normally closed two way poppet valve  524  and first right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 A, third right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 C and second right wing rear lift wheel bypass valve  548 B, second solenoid operated normally closed two way poppet valve  526  and first left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 A, and third left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 C and second left wing rear lift wheel bypass valve  550 B.   
           In a sixth step  1010 , purge the wing rear lift wheel bypass circuits between the hydraulic cylinders  54  of the rear lift wheels  52  and the hydraulic cylinders  60  of the outer set of toolbar lift wheels  53  of air while continuing to purge the front gauge wheel bypass circuits of air. Again, in doing so, it is only necessary to extend these cylinders by two or three inches.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  310 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A and first right wing front gauge wheel bypass valve  348 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A and first left wing front gauge wheel bypass valve  350 A, first solenoid operated normally closed two way poppet bypass valve  314 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 A and first right wing rear lift wheel bypass valve  352 A, fourth right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 D and fourth right wing rear lift wheel bypass valve  352 D, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 A and first left wing rear lift wheel bypass valve  354 A, and fourth left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 D and fourth left wing rear lift wheel bypass valve  354 D   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  410 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A, first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A, first solenoid operated normally closed two way poppet bypass valve  414 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 A and first right wing rear lift wheel bypass valve  448 A, fourth right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 D and fourth right wing rear lift wheel bypass valve  448 D, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 A and first left wing rear lift wheel bypass valve  450 A, and fourth left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 D and fourth left wing rear lift wheel bypass valve  450 D   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating or keeping active third solenoid operated normally closed two way poppet valve  528  and first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A, fourth solenoid operated normally closed two way poppet valve  530  and first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A, first solenoid operated normally closed two way poppet bypass valve  514 , first solenoid operated normally closed two way poppet valve  524  and first right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 A, fourth right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 D and third right wing rear lift wheel bypass valve  548 C, second solenoid operated normally closed two way poppet valve  526  and first left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 A, and fourth left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 D and third left wing rear lift wheel bypass valve  550 C   
           In a seventh step  1012 , finish purging the front gauge wheel bypass circuits of air. In doing so, it is only necessary to extend the hydraulic cylinders  62  of the gauge wheel assemblies  56  and the hydraulic cylinders  64  of the gauge wheel assemblies  70  by two or three inches.
           For the tillage implement hydraulic system  300  shown in  FIG. 11 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  310 , first right wing rear lift wheel hydraulic cylinder three way solenoid valve  336 A and first right wing rear lift wheel bypass valve  352 A, first left wing rear lift wheel hydraulic cylinder three way solenoid valve  338 A and first left wing rear lift wheel bypass valve  354 A, first solenoid operated normally closed two way poppet bypass valve  314 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 A and first right wing front gauge wheel bypass valve  348 A, fourth right wing front gauge wheel hydraulic cylinder three way solenoid valve  332 D and fourth right wing front gauge wheel bypass valve  348 D, first left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 A and first left wing front gauge wheel bypass valve  350 A, and fourth left wing front gauge wheel hydraulic cylinder three way solenoid valve  334 D and fourth left wing front gauge wheel bypass valve  350 D.   For the tillage implement hydraulic system  400  shown in  FIG. 12 , this may be done by activating or keeping active first solenoid operated normally closed directional control check valve with manual override  410 , first left wing rear lift wheel hydraulic cylinder three way solenoid valve  438 A and first left wing rear lift wheel bypass valve  450 A, first right wing rear lift wheel hydraulic cylinder three way solenoid valve  436 A and first right wing rear lift wheel bypass valve  448 A, first solenoid operated normally closed two way poppet bypass valve  414 , first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 A, fourth right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  432 D, first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 A, and fourth left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  434 D.   For the tillage implement hydraulic system  500  shown in  FIG. 13 , this may be done by activating or keeping active first solenoid operated normally closed two way poppet valve  524  and first right wing rear lift wheel hydraulic cylinder three way solenoid valve  536 A, second solenoid operated normally closed two way poppet valve  526  and first left wing rear lift wheel hydraulic cylinder three way solenoid valve  538 A, first solenoid operated normally closed two way poppet bypass valve  514 , third solenoid operated normally closed two way poppet valve  528  and first right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 A, fourth right wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  532 D, fourth solenoid operated normally closed two way poppet valve  530  and first left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 A, and fourth left wing front gauge wheel hydraulic cylinder three way solenoid valve with internal check valve  534 D.   
           In an eighth step  1014 , again raise the agricultural tillage implement  10  by extending each of the rear lift wheels  52 , the gauge wheel assemblies  56 , the toolbar lift wheels  53 , and the gauge wheel assemblies  70 , using the hydraulic cylinders  54 , the hydraulic cylinders  62 , the hydraulic cylinders  60 , and the hydraulic cylinders  64 , respectfully, until they expose their re-phasing ports. The same valves as used in the first step  1000  are used in the eighth step  1014 .
 
The first through eighth steps  1000  through  1014  above may be performed by the implement controller or controllers in response to a single operator input or response, such as “Purge Raise/Lower System,” or similar selection or prompt.
   In a ninth step  1016 , fold the main shank frame  28  over the tool bar  24  using the hydraulic cylinder  58  represented in  FIGS. 7 and 8  as main shank frame hydraulic cylinders  928  and  628 , respectively. For the tillage implement hydraulic system  900  shown in  FIG. 7 , this may be done by activating second main shank frame solenoid operated normally closed two position one way valve  912 .   In a tenth step  1018 , raise the wing front shank frames  66 A through  66 F using hydraulic cylinders  68  and the wing section rear auxiliary implements  78  using hydraulic cylinders  90 . For the tillage implement hydraulic system  900  shown in  FIG. 7 , this may be done by activating first solenoid operated normally closed two way poppet valve  920  and second solenoid operated normally closed two way poppet valve  922 .   For the tillage implement hydraulic system  600  shown in  FIG. 8 , ninth step  1016  and tenth step  1018  may be accomplished by simply pressurizing the hydraulic line entering the manifold  652  at first check valve  610 .   In an eleventh step  1020 , lower the wing front shank frames  66 A through  66 F using hydraulic cylinders  68  and the wing section rear auxiliary implements  78  using hydraulic cylinders  90 . For the tillage implement hydraulic system  900  shown in  FIG. 7 , this may be done by activating first solenoid operated normally closed two way poppet valve  920  and second solenoid operated normally closed two way poppet valve  922     In a twelfth step  1022 , unfold the main shank frame  28  from over the tool bar  24  using the hydraulic cylinder  58 . For the tillage implement hydraulic system  900  shown in  FIG. 7 , this may be done by activating first main shank frame solenoid operated normally closed two position one way valve  910 .   For the tillage implement hydraulic system  600  shown in  FIG. 8 , eleventh step  1020  and twelfth step  1022  may be accomplished by simply pressurizing the hydraulic line entering the manifold  652  at fourth check valve  650 .
 
The ninth through twelfth steps  1016  through  1022  above may be performed by the implement controller or controllers in response to a single operator input or response, such as “Purge Shank Fold System,” or similar selection or prompt.
   In an optional thirteenth step  1024 , cycle the hitch lock cylinder  706  shown in  FIG. 9  back and forth by alternately pressurizing the hydraulic lines entering into first pilot to open check valve  702  and second pilot to open check valve  704 .   In an optional fourteenth step  1026 , activate first solenoid operated normally closed two way poppet valve  802  and second solenoid operated normally closed two way poppet valve  804 . Alternately pressurize the hydraulic lines entering into first solenoid operated normally closed two way poppet valve  802  and second solenoid operated normally closed two way poppet valve  804  until the pull hitch hydraulic cylinder  806 , the right pivoting swing arm hydraulic cylinder  812  and left pivoting swing arm hydraulic cylinder  814 , and the right main fold hydraulic cylinder  820  and left main fold hydraulic cylinder  822  fully cycle in sequence.
 
The thirteenth and fourteenth steps  1024  and  1026  above may be performed by the implement controller or controllers in response to a single operator input or response, such as “Purge Wing Fold System,” or similar selection or prompt.
       
 
         [0166]    The invention described above has been described as being used on an agricultural tillage implement. However, it is contemplated that the principles of the Computer Controlled Hydraulic Bleed Sequence may be used on any of a number of agricultural implements or machines, which are considered to be within the scope of the present invention. Therefore, while this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.