Patent ID: 8517157

Claim:
A drive control system for a crawler vehicle, the system comprising: a lever pivoting about a hinge fixed to a frame of the vehicle; hydraulic distributor activated by said lever as of an initial position; said hydraulic distributor configured to supply pressurized oil over a feed line to a hydraulic actuator; and said hydraulic actuator configured to engage and release a central clutch; a hydraulic feedback for restoring said hydraulic distributor to said initial position; the hydraulic feedback comprising a triple-slide valve activated by the lever, wherein depending on the slide settings of the valve, pressurized oil is fed to a first hydraulic cylinder having a double-acting piston that moves in a given direction; the piston forming part of an actuator of the central clutch; and the oil in a first chamber of a second hydraulic cylinder is compressed by the piston and forced along a line into a second chamber of a third hydraulic cylinder, and the incoming pressurized oil to the second chamber moves a piston, integral with the slides of the valve, in a given direction to reset the slides of the valve to the initial position.