Patent ID: 8191698

Claim:
A hydraulic system comprising: a clutch assembly, said clutch assembly being hydraulically actuated; a pressure device in fluid communication with said clutch assembly; and a single multi-position actuator device in fluid communication with and connected to both of said pressure device and said clutch assembly, said actuator device having a first position in order for said pressure device to fluidly communicate with said clutch assembly, a second position for maintaining fluid pressure in said clutch assembly, and a third position for purging air from said hydraulic system and reducing pressure in said clutch assembly; wherein said pressure device has a cylinder with a piston slidably disposed in said cylinder, and said piston slides within said cylinder in order to increase or decrease the fluid pressure transferred to said clutch assembly; wherein said pressure device has a driving mechanism and a ball screw mechanism driven by said driving mechanism, said ball screw mechanism operably connected to said piston through the use of a ball nut, and as said ball screw mechanism is rotated by said driving mechanism, said ball nut and said piston translate in said cylinder.