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 57.
Internal Brake Mechanisms (Semitrailers M270 and
M269)
a.
Removal
of
Brake
Shoes.
C a u t i o n : Make
certain
that
all
air.
pressure
has
been
re-
lived
from
braking
system
by
opening
drain
cock
12)
on air reservoir.
(1) Remove wheels
52b).
(2)
Remove
hub
and
brake
drum
(3) Remove shoe tension spring (fig. 16).
(4) Remove C-washers and anchor pin strap from an-
chor
pins
16).
Remove
brakeshoes.
b.
Removal
of
Brake
Camshaft.
Using
snap
ring
pliers,
re-
move snap ring from splined end of camshaft and slide
off
washer (fig. 18) .
Disconnect
slack
adjuster
18)
from
brake air chamber yoke by removing cotter pin and clevis pin.
Slide
off
slack
adjuster,
spacer
and
two
washers.
Withdraw
camshaft from outer side of
backing plate (fig. 16) and re-
Mark camshaft to insure instal-
move washer from camshaft.
lation at original location.
c. Installation of Brake Camshaft.
(1)
Place
washer
on
camshaft.
Following
marks
made at removal (b above), insert camshaft into mount-
ing bracket from outer side of backing plate.
Slide
camshaft
into
place
carefully,
using
rotary
motion,
to
position it in bearings and seals without damage.
(2) Install two washers and spacer over splined end of
camshaft and against camshaft mounting bracket.
(3) Apply a thin coat of oil on splines of camshaft and
A slight
slide slack adjuster (fig. 18) into position.
rotary action of slack adjuster will allow splines in
slack adjuster to mesh with splines on camshaft.
( 1) Position washer on splined end of camshaft and in-
stall snap ring.
(5) Turn worm shaft (fig. 42) of slack adjuster until arm
can be positioned in brake air chamber yoke.
Coat
1/2
x
1
13/64
clevis
pin
with
light
film
of
oil
and
Se-
attach arm of slack adjuster to yoke (fig. 18).
cure clevis pin with 1/8 x 7/8 cotter pin.
d.
Installation
of
Brakeshoes
16).
(1)
Coat
anchor
pins
and
ancher
pin
strap
with
light
Install
shoes
on
anchor
pins.
Install
film of grease.
strap on anchor pins and secure with C washers.
(2) Attach shoe tension spring to spring anchor pins near
TAGO 1321
94
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