Figure 5-12. Hand brake assembly.

1 Backing plate

2 Lockwasher

3 Capscrew

4 Roller

5 Actuating lever

6 Shoe assembly

7 Spring

8 Brake drum

Figure 5-12. Hand brake assembly.

(2) Resurface drums if scored, cracked from

5-13. Wheel Brake Assembly

heat checks, or out-of-round.

Do not resurface

a. Removal and Disassembly.

previously turned drums or turn in excess of 0.030 inch.

(3) If resurfacing drums is not required, polish

(1) Remove drive wheels (TM 10-3930-618-

surface with fine emery cloth to remove discoloration and

20).

lining residue.

(2) Remove planetary gears, axle shafts,

(4) Inspect linings for abnormal wear and

hubs, and brakedrums (para 5-19).

brake fluid or grease saturation.

(3) Remove shoe retaining spring (1, fig. 5-

(5) Replace linings if worn to less than 1/8

13, sheet 1 of 2).

inch or if saturated with brake fluid or grease.

(4) Remove the brake shoe return spring (2).

(6) Inspect shoes for distortion and cracks.

(5) Remove the brake shoe anti-rattle

(7) Inspect for weak or broken return springs.

components (3, 4, 5, and 7).

c. Reassembly and Installation.

(6) Remove the brake shoes (6).

(1) Reverse procedures in a above.

(7) Replace adjusting pawl assembly if spring

(2) Refer to figure 5-13 for installation

tension test is less than 107 lbs. (see fig. 5-13, sheet 2

instructions for the adjusting pawl.

of 2).

CAUTION

(8) Remove adjusting pawl (14) from backing

plate.

Do not attempt to adjust this system

manually by using a wrench to turn

NOTE

tack welded pawl nut.

It will be necessary to break tack weld to

(3) Brakes are self-adjusting and will maintain

remove adjusting pawl nut.

a predetermined lining to drum clearance. Minimum

lining to drum clearance is established by width of the

b. Inspection and Repair.

adjusting pawl slots in the shoe webs. Lining to drum

(1) Examine brake drums for scoring, heat

clearance will be established with the first pedal

checks, or out-of-round condition.

application.

5-17