Hydraulic system for driving axial piston type hydraulic motor

A hydraulic system for driving an axial piston type hydraulic motor having a swash plate pivotably rotatable relative to a shaft, a cylinder block coupled to the shaft, and a plurality of reciprocating pistons being disposed in the cylinder block and further coupled to the swash plate, the hydraulic system comprising:

• a cylinder;
• a swash plate piston received within said cylinder, said swash plate piston dividing said cylinder into a first chamber and a second chamber;
• a rod connecting said swash plate piston and the swash plate;
• a pair of springs disposed within each chamber, said springs exerting biasing forces on said swash plate piston;
• a first fluid passage connected to said first chamber;
• a second fluid passage connected to said second chamber;
• a piston control valve for selectively connecting said first and second fluid passages to a hydraulic pump and a tank or, alternatively, connecting said first fluid passage to said second fluid passage;
• an inlet passage provided between an inlet port of the hydraulic motor and said hydraulic pump;
• an outlet passage provided between an outlet port of the hydraulic motor and said tank;
• a main control valve provided within said inlet passage for selectively opening said inlet passage in response to a predetermined signal;
• and
• a remote control valve outputting a predetermined signal to said piston control valve and said main control valve.