GMC C Series 1993, Repair Manual

Page: 123 / 264

5H-18 AIR BRAKE VALVES
! !l I
25. 0 -n n g s (55 arid 56) inexhaust'cover (54).
26. Exhaust cover (54) in valve main body (51).
27. Retaining ring (53) in valve main body (51).
28. Relay piston spring (65) in valve main body (51)
large diameter end first.
• The relay piston spring (65) is not used in all
valves.
29. O-ring (62) and sealing ring (86) on valve cover
(52). V
• Use lubricant to hold them in place.
30. O-ring ;(64) on relay piston (63):
31. Relay;piston (63) in valve main body (51).
32. Mounting bracket on valve cover (52).
• Align the marks made during disassembly.
33. Valve cover (52) and mounting bracket on valve
main body (51).
34. Four cap screws (60) and washers (61).
Q ' Tighten
Cap screws (60) to 17 N.m (13 ft. lbs.).
SAFETY VALVE
4 * * f
BENDIX ST-3
Remove or Disconnect (Figure 23)
1. Body (4) from, cage (2)/
2. Ball valve (3).
i 3. Release pin (1).
/ 4. Spring (6).
S53
Clean
All parts in mineral spirits or another suitable Sol­
vent.
>
Install or Connect (Figure 23)
1. Spring (6) in cage (2).
2. Release pin (1). ? ,
3. Ball valve (3). , '
N O T IC E : S e e
“
N o tic e ” o n p a g e 5 H -1 .
4. Body..(4). ; , .
Tighten
Body (4) to 16 N.m (12 ft. lbs ).
■ r ,
:;1: Release Pin
2. Cage
}3. Ball Valve
4. Body
5. Exahust Port
6. Spring
B6042
Figure 23—Bendix ST-3 Safety Valve
SPRING BRAKE CONTROL VALVE
4- +
BENDIX SR-1
Remove or Disconnect (Figure 24)
1. Hex socket plug (8)..
2. Spring (9).
3. Guide (10):
4. Check valve (11).
5. Screws (20).
6. Exhaust cover (19),
7. Inlet and exhaust valve assembly (32).
8. Retainer ring (18).
9. Seal retainer (17), inner O-ring (15), and outer
O-ring (16) from retainer,
10. Valve spring (14).
11. Valve retainer (13).
12. Cap (22) and O-ring (23).
13. Stop (24).
‘ ; ,
14. Spring (25).
15. Valve; disc (26).
f f ~ | important
• Tlie cover in the next step is Under spring load
and should be held firmly while removing the