Chevrolet 70 1969 Series, Shop Manual

Page: 246 / 913

BRAKES SB-53
1 Brake Air Chamber Assembly
2 Non-Pressure Half
3 Brake Shoe Assembly
4 Adjusting Bolt Assembly
5 Identification Ring
6 Spanner Nut Retainer
7 Spanner Nut
8 Plunger Seal and Retainer
9 Adjusting Pawl (Plunger Guide)
10 Hollow Cap Screw
11 Gasket
12 Spring
13 Adjusting Sleeve (Actuator)
14 Adjusting Plunger
15 Wedge Spring Retainer
16 Roller
17 Plunger Housing
18 Anchor Plunger (Solid)
19 Guide Screw
20 Gasket
21 Plunger Seal and Retainer
22 Roller Retaining Cage
23 Wedge Spring
24 Cotter Key
25 Washer
26 Wedge Shaft
27 Wedge Guide
28 Diaphragm Plate (Push Rod)
29 Rubber Boot
30 Pressure Half
1-2293
Figure 25— Automatic Adjuster Assembled
Any time the adjuster assemblies are re­
moved for service they should be lubricated as
directed in the following procedures.
The adjuster system should be disassembled
whenever brake shoes are relined and inspected
for the general condition of all moving parts. It is
advisable to use new plunger seals and gaskets
when removing and installing these parts.
R E M O V A L (Refer to Fig. 24)
1. Remove brake shoes and brake chambers
as detailed under applicable procedures.
2. Remove bolt and plunger guide gasket from
housing.
3. Remove spring and plunger guide.
4. Unscrew adjusting bolt from actuator.
5. Using a screwdriver, pry plunger seal out
of spider housing.
6. Remove actuator and adjusting plunger.
IN S T A L L A T IO N (Refer to Fig. 24)
N O T E : Make sure that adjusting mechanism
is installed at proper end of spider so that brake
shoe ends are mounted in proper position. Also
make certain that all parts are properly lubri­
cated. All threads on all components should be
coated with lubricant to assure smooth, free oper­
ation. The tip of the plunger guide and the entire
plunger should also be coated. See LU BR IC ATION
(SEC. 0) for type of lubricant to be used.
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L