Transmission Parking Brake

TM 10-3930-634-34

4-8. Transmission

Parking

Brake

a. General. The transmission parking brake is

mounted at the rear of the transmission as shown in

figure 4-31. Application of the parking brake locks

the output shaft preventing movement of the forklift

truck. The brake drum is splined and mates with the

output shaft. Two brake shoes when applied provide

the means for locking the output shaft.

b. Removal and Disassembly.

(1) Remove propeller shaft and yoke flanges (fig.

5-l).

NOTE

If brake shoes (9, fig. 4-32) are to be replaced,

remove six screws (4) and washers (5) and re-

move brake drum (6) to gain access to brake

shoes for replacement.

(2) Block output shaft and remove output flange

nut (1, fig. 4-32), washer (2), and packing (3).

(3) Remove parking brake components as shown

in figure 4-31.

c. Cleaning. Clean all metal parts except brake

shoes with cleaning solvent P-D-680. Dry parts thor-

oughly.

d. Inspection and Repair

(1) Inspect springs (8, fig. 4-32) for evidence of

permanent set. Replace as necessary.

(2) Inspect brake drum (6) for excessive scoring or

cracks. Replace if necessary.

(3) Inspect brake shoe (9) linings for excessive

wear or oil damage. Replace as necessary.

(4) Inspect flange (7) for cracks, deformed splines,

and pitting. Replace if necessary.

(5) Inspect brake actuator (10) and backing plate

(13) for cracks, pitting, and deformation. Replace if

any of these defects are found.

e. Reassembly and Installation. Reassemble and in-

stall the transmission parking brake in reverse se-

quence of disassembly and removal.

f. Reassembly.

(1) Submerge all parts, prior to reassembly, in

clean oil which will be used in the transmission (refer

to current lubrication order).

(2) Apply a thin coat of permatex No. 2 or equiva-

lent on the outer diameter of seals to assure an oil

tight fit.

(3) Reassemble the control valve assembly in re-

verse order of disassembly.

g. Installation. Install the control valve assembly in

reverse order of removal.

4-14