Patent ID: 6990888

Claim:
A hydraulic control mechanism which is selectively configurable for use, independently, with a constant volume hydraulic power system and a constant pressure hydraulic power system, said hydraulic control mechanism comprising: a housing having a cavity defined by walls therein; a piston retained in said cavity of said housing, said piston being capable of reciprocal movement within said cavity, said piston having a first side and a second side; a retract chamber defined within said cavity between one of said walls of said cavity and said first side of said piston; a drive chamber defined within said cavity between one of said walls of said cavity and said second side of said piston; a controllable valve assembly coupled to said housing having an inlet passageway, an outlet passageway, a central passageway, and a cross passageway, said cross passageway being in fluid communication with said drive chamber, said central passageway being in fluid communication with said retract chamber; and an adjustment assembly coupled to said housing having a valve chamber and a valve member positioned within said valve chamber, said valve chamber being in fluid communication with said central passageway and said cross passageway, said valve chamber defining a valve seat proximate to one of said central and cross passageways, said valve member being displaceable within said valve chamber.