TM 5-3805-255-14
0059
BLEEDING HYDRAULIC BRAKE CIRCUIT
WARNING
Ensure wheels are chocked to prevent loader from moving. Failure to follow this warning
may result in death or injury to personnel.
NOTE
The hydraulic portion of each power cluster and wheel brake assembly must be bled when
it is suspected that air is present in brake fluid.
Manually bleed hydraulic lines of a power cluster as described below:
a. Start engine to charge compressed air portion of brake system. Shut down engine (WP 0005).
WARNING
Contact with engine/hydraulic oil can damage skin. Wear gloves when handling engine/hydraulic oil.
If oil contacts skin, wash it off immediately. Failure to follow this warning may cause injury to
personnel.
b. Remove hydraulic cylinder fill cap and fill power cluster reservoir (WP 0013) with brake fluid. Ensure
reservoir remains full during entire bleeding operation.
c.
Attach a bleeder hose to bleeder screw at power cluster. Submerge opposite end of hose in a suitable
container partially filled with brake fluid.
NOTE
If a bleeder hose is not used, close bleeder screw each time before releasing treadle
valve.
d. Open bleeder screw one turn and slowly apply treadle valve. Make additional treadle applications until no
bubbles escape from bleeder hose.
e. Close bleeder screw and remove bleeder hose from bleeder screw.
f.
Attach a bleeder hose to bleeder screw at wheel cylinder. Submerge opposite end of hose in a suitable
container partially filled with brake fluid.
NOTE
If a bleeder hose is not used, close bleeder screw each time before releasing treadle
valve.
g. Open bleeder screw one turn and slowly apply treadle valve. Make additional treadle applications until no
bubbles escape from bleeder hose.
h. Bleed hydraulic cylinders on each wheel until brake pedal is firm.
i.
Fill cylinder reservoir to within 0.50 in. to 0.375 in. (12.7 to 9.5 mm) of fill hole.
j.
Install hydraulic cylinder fill cap.
END OF TASK
END OF WORK PACKAGE
0059-20
