SERVICE REPAIR
EJ1.25XL, EJ1.50XL, EJ1.75XL Europe [C114]
1
INTRODUCTION
GENERAL
This section has a description and the service proce-
dures for the brake system. The parts of the brake system
include the master cylinder, the brake shoes, wheel cyl-
inders, pedals and linkage, and the parking brake sys-
tem. Some electric lift trucks have an optional seat
brake. The linkage and adjustments are shown at the end
of this section.
DESCRIPTION AND OPERATION
The master cylinder has a housing and a piston assem-
bly. The reservoir for the brake fluid is part of the hous-
ing for the master cylinder. When the brake pedal is
pushed down, the push rod moves the piston assembly.
The primary cup pushes the brake fluid through the
check valve to the wheel cylinders. The secondary cup
keeps the fluid that is above the primary cup in the mas-
ter cylinder.
When the brake pedal is released, the return spring
causes the piston assembly to return to the stop in the
bore. The return springs for the brake shoes cause the
pistons in the wheel cylinders to retract. The fluid in the
wheel cylinders is pushed back through the lines to the
check valve. The fluid pressure in the brake lines causes
brake fluid to flow through the check valve to the master
cylinder bore. The check valve keeps a low pressure in
the brake lines so that the lips of the seals in the wheel
cylinders are held in position against the bores.
When the brake pedal is released quickly, the return
spring moves the piston faster than the brake fluid can
flow through the check valve. Fluid from the inlet port
flows from behind the piston through the holes drilled in
the piston. The flow of fluid bends the lip of the primary
cup and permits fluid to enter the pressure chamber. A
port between the reservoir and the bore permits brake
fluid to fill the volume in the reservoir and the bore. This
compensator port has a very small diameter and is found
near the primary cup on the pressure side of the piston.
The