Chevrolet 30 Series 1967 Service Manual page 271

end of shaft to edge of body (A, fig. 89) is 0.625".
Install new welch plug in worm shaft bore.
4. Position cover plates on body and attach with new
rivets. Covers must be flat and in good contact with
body after riveting.
Installation
1. If a new slack adjuster is being installed, make sure
it is the same size and type as that removed. Make
sure spacing washer is in place on camshaft. Slide
the slack adjuster onto camshaft and attach with
spacer and lock ring.
2. Connect brake chamber push rod yoke to slack ad­
juster with clevis pin and cotter pin. Refer to
"B rake Chamber Installation" for adjustment of
brake chamber push rod.
3. Adjust brakes as previously directed under "Brake
Adjustments."
Lubrication
Slack adjusters are permanently lubricated by the man­
ufacturer and require no periodic lubrication. However,
if a slack adjuster has been dismantled and repaired in
accordance with these procedures, it becomes necessary
to lubricate upon reassembly.
1. Remove one plug from slack adjuster side plate.
2. Using a pressure grease gun, inject grease into the
hole in side cover while turning the wormshaft
approximately 50 revolutions in one direction.
3. Install side plug securely.
4. Rotate wormshaft three revolutions in the opposite
direction.
5. Refer to Section 0 - Lubrication in this manual for
additional information.
Slack Adjuster Operating Test
Apply brakes and make sure all slack adjusters rotate
freely and without binding. Release brakes and make
sure all slack adjusters return to released position
freely without binding.
With brakes released, make sure the angle formed by
slack adjuster arm and brake chamber push rod is
greater than 90 degrees. All slack adjusters should be
set at the same angle. With brakes applied, make sure
the angle formed by the slack adjuster arm and brake
chamber push rod is still slightly greater than 90 degrees
Fig . 90—Removing Camshaft (Front shown as T yp ica l)
and that all are at the same angle. If angle is less than
90 degrees with brakes applied, slack adjuster is going
"over cen ter." Adjust brakes as previously described
under "B rake Adjustments."
BRAKE SHOES AND CAMSHAFTS
(Figs. 89, 90, 91 and 92)
Removal
F r o n t
1. Remove wheel nuts, rim locks and rim and tire
assembly.
2. Remove cotter pin, spindle nut, spacer and outer
bearing.
3. Remove wheel and brake drum assembly.
4. Remove brake shoe pull back springs.
5. Remove brake shoe hold down nuts, washers and
anchor pin "horseshoe" clips.
. Remove brake shoes.
6
7. Remove cotter pin from end of camshaft and remove
spacers.
. Tap out camshaft (fig. 90).
8
R e a r
1. Remove wheel nuts, rim locks, and outer tire and
rim assembly.
2. Remove rim spacer,
assembly.
3. Remove axle shaft retaining nuts and "sp lit wedge"
locks.
4. Withdraw axle shaft.
5. Remove axle shaft lock nut, lock, and adjusting nut.
Fig. 91—Rear Brake Parts Id entification
1. A ctuating Cam
2. Roller
3. Brake Shoe Facing
4. Brake Shoe
5. Anchor Pin Lock Ring
BRAKES 5-57
then inner rim and tire
6. Anchor Pin
7. Flange Plate
8. Shoe Return Spring
9. Roller Pin
CHEVROLET TRUCK SERVICE M ANUAL