Chevrolet 10 series 1973, Overhaul Manual

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BRAKES 5 -3 3
1. Hydraulic Cylinder
2. Control Tube Seal
3. Control Tube Nut
4. Vacuum Hose
5.
Rear Shell Control Tube
6. Rear Shell
7. Nut
8. Clamp Band
9. Clamp Bolt
Fig. 2E--Removal of Control Tube, Clam p Band, Rear
Shell and D iaphragm
(5) and lift front shell (4) off flange of
cylinder. Remove rubber gasket (3) from
groove in flange of hydraulic cylinder.
1. Piston 8.
2. Seal Retainer 9.
3. Push Rod Seal Cup 10.
4. Push Rod Bearing 11.
5. ”0" Ring Seal 12.
6. S to p W a s h e r 13.
7. Snap Ring
Push Rod
Piston Cup
Piston (Same as Item 1)
Retainer Pin
Retainer Ring
Push Rod Seal
Fig. 4E -D isassem bly of Push Rod and Piston
1.
H ydraulic C ylin der 8. Return Sprin g
2.
Snap Ring
9.
W a sh er
3.
Gasket
10.
Diaphragm Plate
4.
Front Shell
1 1. Diaphragm
5.
Capscrews
12. W a s h er
6.
Push Rod
13.
Nut
7.
Nut
Fig. 3E--Removal of D iaphragm , Spring, Front Shell
and Gasket
Push Rod and Piston (Fig. 4E)
1. Working on clean bench, remove piston parts (2
through 12) from push rod (8) off piston end of
push rod.
2. Slide retainer ring (12) out of groove in piston (10)
and separate piston from push rod (8) by removing
retainer pin (11).
3. With ice pick or thin-bladed screwdriver, remove
cup (9) from piston. Slide seal retainer (2), push rod
seal cup (3), push rod bearing (4), stop washer (6)
and snap ring (7) off piston end of push rod.
4. Remove "O" ring seal (5) from bearing groove.
5. If necessary to replace push rod seal (13) located in
end of push rod, grip seal with pliers and pull it
from end of push rod. Discard seal.
Control Valve (Fig. 5E)
1. Scribe across flanges of control valve body (12) and
hydraulic cylinder housing (3).
2. Remove four capscrews (13) and lift off valve body
and spring (9).
3. Remove washer (8), diaphragm (7), washer (6), and
cup (4) from valve piston (5).
4. Using screwdriver, carefully pry off plastic valve
body cover (16).
5. Pry off plastic retainer (1st stage poppet) (15), lift
off atmospheric (2nd stage) poppet (14) and then
remove vacuum poppet and stem (10) and poppet
spring (11) from valve body (12).
OVERHAUL MANUAL