Section 1
1 - 29
Sequence of Operation, High-Performance Winch -
BRAKE-OFF
The operator depresses the BRAKE-OFF switch. Pilot
control pressure communicates in the logic control mani-
fold to release the brake, open the BRAKE-OFF valve,
and shift the hydraulic motor to HI-SPEED displacement.
Pilot control oil fl ow also saturates the inlet B port of the
motor.
The operator drives away from the load, and the entire
gear train rotates as wire rope spools off the drum. The
hydraulic motor effectively operates as a pump and circu-
lates oil from the B port to A port through the BRAKE-OFF
manifold. An orifi ce in the BRAKE-OFF manifold provides
a resistance to fl ow across the hydraulic motor, and there-
fore limits the rotating velocity by increasing the tractive
effort required by the tractor to drive away from the load.
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