SUB-SECTION 5H
WINCH BRAKE VALVES
SUB-SECTION 5H
WINCH BRAKE VALVES
REMOVAL. To remove the winch brake valve, proceed as
WINCH BRAKE VALVE (36Q76)
follows:
DESCRIPTION. A 36Q76 winch brake valve is shown in
1. Clean the valve and surrounding area with a suitable
Figure 5H-1. This valve is operated by the same linkage that
solvent.
actuates the winch control valve, and is used to release the
winch brake used on the P&H winch. The operation of the
2. Disconnect the three hydraulic lines. Cap the lines and
winch brake valve is as follows:
plug the valve ports as each line is disconnected.
When the winch control lever is in the neutral position,
3. Remove the three attaching screws and slide the valve
hydraulic fluid from the swing pump is allowed to flow to
beck to disengage it from the linkage.
the winch brake and tank simultaneously. Since the flow is
allowed to return to tank, no pressure will buildup in the
brake chamber, and the brake will remain set.
DISASSEMBLY. Disassemble the winch brake valve as
follows (see Figure 5H-1):
The control lever linkage allows the winch lever to be
moved to the raise position without moving the winch
1. Remove the two screws from the spool cap and spacer.
brake valve spool. Since the valve spool does not move,
The spool cap, spacer and spring are now free, and should
hydraulic fluid will continue to flow to the brake chamber
be removed.
and tank, and the brake will remain set.
2. Remove the snap ring and washer from the spool.
When the winch control lever is moved to the lower
3. Slide the spool out of the valve body.
position, the winch brake valve spool is pushed inward into
the valve body. Inward movement of the spool will block
4. Remove the two O-rings from the valve body.
the tank passage, causing all the oil to flow to the brake
REPAIR. All components of the winch brake valve are
chamber. Pressure in the brake chamber will then release
serviceable, except for the valve body and spool. If either a
the brake.
Figure 5H-1. Winch Brake Valve (36Q76)
5H-1
