SERVICE REPAIR
E45XM E50XM E55XM E60XM E65XM [F108]
1800 SRM 574
Description and Operation
General
This section has a description and the service pro-
cedures for the parts of the brake system. The brake
system includes the following parts: master cylinder,
brake shoes, wheel cylinders, parking brake system,
and seat brake system. A troubleshooting section is
included at the end of this section.
Description and Operation
SERVICE BRAKES
A service brake assembly is installed on the mounts
at each end of the drive axle. The parts of the service
brake assembly are shown in Figure 4 and Figure 5.
When the brake pedal is pushed, fluid pressure from
the master cylinder causes the pistons in the wheel
cylinders to extend. The pistons expand the brake
shoes against the drums. See Figure 1.
The clearance between the brake shoes and the brake
drum is adjusted automatically. An adjuster link-
age turns the adjuster wheel to adjust the clearance.
When the lift truck moves in the REVERSE direc-
tion and the brakes are applied, the rear brake shoe
and the adjuster links move with the drum. This
linkage moves the adjuster lever to rotate the ad-
juster wheel. The adjuster wheel can turn only when
there is clearance between the lining of the brake
shoe and the brake drum. The adjuster wheel can
also be turned with a tool. A slot in the back plate
gives access to the adjuster wheel.
1. BRAKE PEDAL
2. MASTER CYLINDER
3. BRAKE ASSEMBLY
4. BRAKE FLUID RESERVOIR
Figure 1. Service Brake System
1
Description and Operation
1800 SRM 574
MASTER CYLINDER
The master cylinder is designed for a dual circuit sys-
tem. The master cylinder has two separate pistons
that operate in the single bore of the master cylin-
der. The reservoir for the fluid is pressed into the
two ports on top of the master cylinder and held in
position by seals. When the brake pedal is pushed,
the push rod moves the piston assemblies. The oper-
ation of the master cylinder is as follows:
When the brakes