1800 SRM 951
Service Brake Repair
INSTALL
CAUTION
Verify mounting direction of seal rings, other-
wise leaks may occur.
CAUTION
When mounting new seal rings, use caution
not to damage sealing lip by using a suitable
mounting needle with rounded edges.
NOTE:
When replacing piston, sliding and sealing
surfaces must be greased lightly using lubricating
grease.
1.
Replace seals as needed.
2.
Replace remaining individual parts in reverse or-
der of removal.
3.
Install caliper assembly and adjust. See Adjust.
Service Brake Repair
The service brake assemblies are hydraulically actu-
ated wet brakes. Most repairs are seal replacement
at the hub and brake disc housing. Replace these
seals any time the hub is removed. See Figure 8.
REMOVE AND DISASSEMBLE
NOTE:
Disassembly of the wet disc brake is required
to replace a leaky seal or worn brake disc pack. Vari-
ous fluids must be drained from the wheel ends. Pre-
pare the truck as follows:
WARNING
Allow the brakes to cool to ambient tempera-
ture (cool to the touch) before draining fluid.
Wear protective gloves. Personal injury can re-
sult.
Use only the type of fluid specified by the
equipment manufacturer. Do not use or mix
different types of fluid. An incorrect fluid can
damage the rubber parts of the assemblies,
which could cause loss of braking and serious
personal injury.
Do not reuse hydraulic fluid or coolant. Used
fluid may be contaminated and can cause in-
correct operation, which can result in serious
personal injury and damage to components.
WARNING
Block the wheels to prevent the vehicle from
moving.
Support vehicle with safety stands.
Do not work under a vehicle that is supported
only by jacks. Jacks can slip or fall over. Seri-
ous personal injury can result.
1.
Verify vehicle is on level surface.
2.
Place blocks under wheels not being serviced to
keep vehicle from moving.
3.
Raise vehicle so that wheels of axle to be serviced
are off the ground. Support vehicle with safety
stands. See the section Periodic Maintenance
for your lift truck.
4.
Remove wheel nuts and dual tire/rim assemblies
from both wheel ends.
Drain Lubricating Oil
1.
Rotate wheel ends so magnetic drain plug in
planetary spider is at bottom. See Figure 9 and
Figure 10.
2.
Place a suitable container under wheel end.
Remove magnetic drain plug from spider, then
drain lubricant. Dispose of lubricant according
to local recommendations.
3.
If necessary, remove magnetic drain plug from
bottom of brake piston housing. Drain and dis-
pose of lubricant from carrier center section. See
Figure 11, Figure 12, and Figure 13.
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