SUB-SECTION 5H
WINCH BRAKE VALVES
Figure 5H-2. Linkage Adjustment
valve body or spool is damaged, the complete valve must be
3. Lock the setscrew by tightening the locknut.
replaced. Make a visual inspection of all parts and replace
parts as required.
WINCH BRAKE VALVE (36Z1028)
DESCRIPTION. A 36Z1028 winch brake valve is shown in
REASSEMBLY. Reassemble the valve as follows. Use
Figure 5H-3. This valve is operated by the same Iinkage that
extreme care in keeping all parts clean prior to and during
actuates the winch control valve, and is used to release the
assembly.
winch brake used on the P&H winch. The operation of the
1. Coat the spool bore and O-rings liberally with clean
winch brake valve is as follows:
hydraulic oil. Then install the O-ring in the valve body.
When the winch control lever is in the neutral position,
2. Install the snap ring and washer on the spool.
hydraulic fluid from the swing pump is allowed to flow to
the winch brake and tank simultaneously. Since the flow is
3. Coat the spool with clean hydraulic oil. Then install the
allowed to return to tank, no pressure will buildup in the
spool in the valve body with a slight turning motion.
brake chamber, and the brake will remain sot.
4. Install the spring, spacer, and spool cap on the end of
The control lever linkage allows the winch lever to be
the valve body, and secure the parts with the two screws.
moved to the raise position without moving the winch
brake valve spool. Since the valve spool does not move,
INSTALLATION. Install the valve in the reverse order of
hydraulic fluid will continue to flow to the brake chamber
removal. Then adjust the actuating linkage as follows (see
and tank, and the brake will remain set.
When the winch control lever is moved to the lower
1. Loosen the locknut and back out the setscrew.
position, the winch brake valve spool is pushed inward into
2. Then turn the setscrew in until it just touches the end of
the valve body. Inward movement of the spool will block
the spool.
the tank passage, causing all the oil to flow to the brake
Figure 5H-3. Winch Brake Valve (36Z1028)
5H-2
