Patent ID: 6578641
Filing Date: 2003-06-17
Classification: A01B

Abstract:
An implement/vehicle hitch system comprising:a hitch mounted on the vehicle and having left and right coupling members; first and second hydraulic cylinders, each coupled to a corresponding one of the coupling members for adjusting a position thereof, each cylinder having a rod end chamber and a piston end chamber; a pressure source; a first valve assembly for controlling communication between the pressure source and the cylinders; first and second gear-type motor/pump units, each motor/pump unit having first and second rotors coupled together by a shaft; and a second valve assembly for controlling communication between the cylinders and the motor/pump units, the second valve assembly having an open position wherein the first rotor of the first unit is communicated with a rod end chamber of the first cylinder, the second rotor of the first unit is communicated with a piston end chamber of the second cylinder, the first rotor of the second unit is communicated with a rod end chamber of the second cylinder, the second rotor of the second unit is communicated with a piston end chamber of the first cylinder, the motor/pump units causing the cylinders to operate synchronously when the second valve assembly is open and the first valve assembly closes communication between the pressure source and the cylinders.