Crawler vehicle drive control system

1. A drive control system for a crawler vehicle, the system comprising:

a lever pivoting about a hinge fixed to a frame of the vehicle;

a 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;

feedback means for restoring said hydraulic distributor to said initial position;

a cable having a first end fixed to a rod of the hydraulic actuator, and a second end connected to the hydraulic distributor to activate or deactivate the distributor, depending on the position of the rod; and

a main pulley integral with said lever, and about which said cable is wound.

2. A system as claimed in claim 1 , further comprising at least one fixed guide pulley about which said cable is wound.

3. A method of feedback controlling drive of a crawler vehicle, the method comprising the steps of:

raising a lever of the vehicle in a given direction, as of a start position;

exerting pull on a cable though the lever to open a hydraulic distributor, which feeds pressurized oil to a cylinder of a hydraulic actuator; and a rod of the cylinder slides in a given direction;

releasing the lever, such that the rod that is attached to one end of the cable is extracted from the hydraulic actuator exerting pull on the cable and pushing a pulley and the lever in a given direction towards the start position; and

resetting the lever to the start position.