Reassembly - TM-10-3930-243-340194

broken or distorted, and when new linings are

(7) Inspect inlet connection block bore where

installed to replace worn out linings. Replace all

O-rings seal for scratches and grooves.

twelve springs to insure uniform retraction.

(8) Inspect brakedrums for cracks, checks,

e. Reassembly. Refer to figure 3-108 and

d i s t o r t i o n , and scored surfaces. Scored brakedrums

reassemble the brake assembly as follows:

can be repaired by turning on a lathe. No brake

( 1 ) Install two new O-rings (3 and 4) on ex-

l i n i n g is any better than the drum it contacts. The

pander tube nozzle (12), lubricating them with

maximum brakedrum should be turned is 0.060 to

vaseline, and install inlet connection (10).

0.080 inch.

(2) If torque plate (11) has been removed from

(9) If any linings have come loose from the

axle housing, install with opening at top. Slide

shoes, re-rivet them.

expander tube (12) with inlet connection over the

(10) If the frame assembly is cracked or

torque plate.

broken, replace.

CAUTION

(11) Recement expander tube shields. If any

Be sure that the inlet connection

shields are loose, all shields should be removed and

shoe

and

opening faces the vehicle, and that the

reversing the block

recemented,

inlet connection drum bolt clearance

a s s e m b l i e s from their original installation. Procure

n o t c h faces the wheel side of the torque

a good neoprene base adhesive compound and use

plate.

per instructions.

( 3 ) Position lower half of frame (9) over ex-

(a) Clean shields with lacquer thinner or

p a n d e r tube and torque plate (11), and secure with

acetone. Do not use petroleum base solvents.

bolts (1). Tighten bolts 3/8"-38 to 42, "-95 to

(b) Place one shoe in brake assembly.

100, 5/8''-l70 to 185 ft.-lbs. torque; dry thread.

Reverse shoe to expose a clean section of tube, free

from initial cement. Mark the position of the ex-

NOTE

tended end of the shoe on the tube. Note the

If necessary to line up frame bolt holes, start at one

position of the m ark in relation to the torque bar of

end and install five bolts; then install a clamp across

the frame to line up the last two holes, and install

the frame assembly. Mark relative positions for

these bolts.

remaining shields.

(c) Coat cement on the tube at each of the

(4) Position upper half of frame (8) over

twelve marks. Coat a spot 3 x 1 with the 1 inch

expander tube and torque plate, making sure that

dimension being centered over the mark. The 3

i n l e t connection lines up with frame cutout. Install

inch dimension should be centered between the

b o l t s . Tighten bolts 3/8"- 3 8 t o 4 2 , " - 9 5 t o 1 0 0 ,

frames.

5/8''-l70 to 185 ft.-lbs. torque; dry thread.

( d ) Coat the inside, or concave side, of the

(5) Place a block and shoe assembly (5),

shields with cement. Keep cement confined to the

between the torque bars so that projecting end of

center 3 inches of the shields.

shoe is approximately centered on a shield (6).

(e) A l l o w c e m e n t t o d r y f o r 5 m i n u t e s .

P a r t i a l l y insert retracting spring (6) to temporarily

(f) Place a shield on the tube so that one half

hold the lining assembly in place.

o f the shield protrudes from under the end of the

( 6 ) Dovetail a second block and shoe assembly

shoe.

i n t o the first block and shoe, and partially insert a

(g) Remove the shoe assembly and press

s e c o n d retracting spring. Drive the first spring fully

shield firmly to the tube.

into position.

(h) Install the next shoe with a shield

(7) Install remaining block and shoe

centered under the protruding end of the shoe.

a s s e m b l i e s in similar manner, that is, always keep

Press shield firmly to tube and install retracting

o n e shoe assembly ahead of the one in which the

spring.

retracting spring is being completely inserted.

(i) C o n t i n u e i n s a m e m a n n e r w i t h t h e

f. Installation.

b a l a n c e of the shields, shoes and springs until all

(1) Refer to figure 3-108 and reinstall the

brakeshoes and shields are in place.

b r a k e assembly. Reinstallation is the reverse order

(12) Replace expander tube if cracked,

of removal.

charred, or if the nozzle is loose.

(2) Replace wheel (TM 10-3930-242-12).

( 1 3 ) Replace brake lining if worn beyond the

g. Bleeding.

minimum thickness if torque bar forms ridges on

( 1 ) Fill reservoir with hydraulic oil (OE 10).

the end face of the linings that may cause the block

NOTE

and shoe assemblies to hang up, or if excessive

Reservoir must be free of dirt. A screen should be

cracking or chipping is evident.

provided in the reservoir to keep out foreign particles.

( 1 4 ) Replace the frame assemblies if distorted

from any crack or damage.

(2) With engine idling, open each bleeder

valve (located on top of automatic slack adjuster

(15) Replace retracting springs if they are

3-156