Reinstallation of Motor Brakeshoes and Drum

TM 10-3930-609-35

If wheel cylinders show evidence of

g. Press bushings out of brakeshoes: only if

fluid leakage, repair cylinder as

bushings are worn and require replacement.

described in paragraph 3-32.

h. Remove cotterpin and nut from end of travel

g. Remove oil seal from backing plate only if

motor shaft; then, withdraw brake drum and woodruff

replacement is required.

key from motor shaft.

3-28. Cleaning Service Brake Parts

3-25. Repair and Replacement of Motor Brake Parts

Remove dust from parts with compressed air and a stiff

Repair of motor brake parts is limited to removal and

bristle brush. If brake fluid has leaked onto brakeshoe

replacement of bushings in brakeshoes. Press bushings

linings, replace linings as described in paragraph 3-30

out of shoes and install new bushings.

Replace

and clean other parts with alcohol. If grease from axle

brakeshoes. If brake linings are worn to less than 1/16

has contaminated parts, wash parts (except wheel

inch at any point, replace brakeshoes.

Replace

cylinders) in SD, and replace linings on brakeshoes.

brakedrum if scored, corroded or pitted. Replace any

other parts that are distorted or excessively worn.

Caution

Do not allow SD to come in contact

3-26. Reinstallation of Motor Brakeshoes and Drum

with rubber parts. SD will cause

(fig. 3-5)

rubber to swell and rot.

a. Place motor brake drum with woodruff key on

motor shaft and secure with nut and cotterpin.

3-29. Inspection of Service Brake Parts

b. Place brakeshoes on mounting stud and secure

a. Inspect wheel cylinders for evidence of fluid

with washer and nut.

leakage.

c. Place compression springs between ends of

b. Inspect linings on brakeshoes for excessive

brakeshoes; then, insert rod cup through brakeshoes

wear.

and springs. Secure rod in place with self.locking nut.

c. Inspect backing plates for distortion or other

d. Secure link between lugs on lower brakeshoe

damage.

with anchor pin. Insert cotterpin through end of anchor

pin to secure anchor pin.

d. Inspect tapped holes and threaded parts for

stripping of threads or other thread damage.

e. Insert linkpin through clevis on rod and through

link; then, insert cotterpin through linkpin to secure

3-30.

Repair and Replacement of Service Brake

linkpin.

Parts

f. Reconnect control linkage to link (TM 10-3930-

a. If linings on brakeshoes are worn to less than

609-12).

1/16 inch at the thinnest point, install new bonded

g. Adjust control linkage (TM 10-3930-609-12).

linings. Install linings in accordance with good practice

h. Reinstall floor plate (TM 10-3930-609-12).

and instructions for use of equipment available.

b. Repair minor thread damage (if practicable) with

3-27. Removal and Disassembly of Service Brakes

tap or thread chaser.

(fig. 3-6).

c. Replace all distorted or damaged parts.

a. Remove front wheels from drive axle (TM 10-

3930-609-12).

3-31. Assembly and Installation of Service Brakes

b. Remove wheel hubs (para 3-8).

(fig. 3-6)

c. Disconnect both brake tubing from adapters on

a. Install wheel cylinders on backing plates with

each wheel cylinder. Use care to prevent kinking or

bolts and washers.

denting tubing and to avoid entrance of foreign matter.

b. Place brakeshoes on backing plate studs and

d. Remove nuts and washers securing brake

install return springs and retaining springs with brake

assemblies to axle housings and withdraw brake

service tools.

assemblies and shims.

c. Install oil seals in backing plates.

e. Use brake servicing tools to remove retaining

d. Install backing plates on axle housings and

spring and return spring; then, lift off brakeshoes.

secure with nuts and washers, being sure to include

f. Remove bolts and washers which secure wheel

same shims removed at disassembly between backing

cylinders to backing plates; then, withdraw wheel

plates and axle housings.

cylinders.

e. Connect brake tubings to adapters in wheel

cylinders.

Note

f. Reinstall wheel hubs (para 3-14).

3-11