The front and rear axles have remote breathers to allow operation in up to 30 inches (762 mm) of water. The rear
axle has lockout cylinders to provide increased stability during hoisting. Steering for each axle is enhanced by dual-
acting hydraulic cylinders that are tied together by a single tie rod, which provides smooth, sharp, synchronized
turning with minimum alignment and adjustment requirements. The service brakes are shoe-type hydraulic units and
are part of the axle. The front axle has a disc brake that can be used either as a parking brake or an emergency
brake. Each axle has its own differential.
1. The winch consists of four basic assemblies: winch base, hydraulic motor and brake valve, brake cylinder
and motor support, and drum assembly. The hydraulic motor turns the gears in the drum assembly, working
2. The winch has a dual braking system: a dynamic brake and a static brake. These two types of brakes work
together to control the speed of the drum assembly. The dynamic brake uses hydraulic pressure to operate
the brake valve, which controls the flow of hydraulic oil to the hydraulic motor. The static brake consists of
multiple friction discs, a brake clutch assembly, and a hydraulic piston and cylinder. The static brake is
automatically applied unless it is released by brake valve pilot pressure at a level lower than that required
to open the pilot-operated spool valve.
3. Either brake system does not affect the winch during hoisting operations. When the operator's control is
placed in neutral, rollers between the cam and outer race wedge to prevent the drum assembly from turning.
The brake valve stops oil flow from the hydraulic motor. For lowering a load slowly, the operator can allow
only enough oil to release the brake without engaging the hydraulic motor. The hydraulic oil dissipates heat
build-up. For faster lowering, the hydraulic pressure is increased by the operator to both release the brake
and engage the hydraulic motor.
END OF WORK PACKAGE