Figure 5-13. Lubrication Chart (Sheet 3 of 3)
from the foundation brake for service, turn these cams
each wheel cylinder is bled. Replace filler plug in master
as necessary to back off the adjustment. The drums can
then easily be removed.
5-77. BLEEDING SERVICE BRAKE SYSTEM. The
Hydraulic brake fluid bled from the
hydraulic brake system must be bled to expel air that
brake system must not be reused.
enters when the lines have been broken or
disconnected. The need is generally indicated by springy
or spongy brake pedal action. Two men are required to
bleed the system. One to maintain a constant supply of
5-79. The lubrication chart (Figure 5-13) for the fork lift
fluid in the master cylinder and to pump the brake
truck includes information pertaining to the type of
pedals. The other man is necessary to perform the
lubricant, lubricating time interval and location of
lubricating points. The service intervals specified in the
lubrication chart are for normal operation where
a. Remove filler plug from master cylinder and fill
moderate temperature, humidity and
with hydraulic brake fluid.
conditions prevail. Reduce the service intervals when
b. Clean the bleeder screws. Attach one end of
operating the truck under unusual conditions to
bleeder hose to bleeder screw and place other end of
compensate for abnormal or extreme conditions.
hose in clean container partially filled with hydraulic
brake fluid. Be sure end of hose is submerged in the
c. Turn bleeder screw counter-clockwise three-
reconditioned engine, an SAE 30 non-
quarters of a turn. Apply a steady pressure to the brake
detergent oil is recommended for the
pedal. Hydraulic fluid containing air bubbles should be
first 40 hours of engine operation.
forced through the bleeder hose into container.
Vehicles are shipped from the factory
d. Maintain the fluid level in master cylinder and
with a break-in oil which should be
continue to operate brake pedal until the fluid flows in a
changed after 40 hours of operation.
steady solid stream without air bubbles. Close bleeder
screw by turning in clockwise direction. Remove bleeder
5-80. AIR CLEANER. The air cleaner on this vehicle
prolongs the life of the engine by preventing dirt and grit
e. Repeat the bleeding procedure at the other
from being drawn through carburetor and manifold into
wheel, replenishing brake fluid supply in master cylinder
the engine and causing excessive wear. The air cleaner