TM 5-3810-307-24-1-1
CONTROL ASSEMBLY, TRAILER AIR SUPPLY AND PARKING BRAKE (CARRIER CAB)
Removal
a.
Ensure battery disconnect switch is in OFF position.
b.
Relieve system air pressure by draining supply (depress pin in center of automatic drain valve), secondary,
and auxiliary air reservoirs.
WARNING
There may be residual pressure in air lines after air reservoirs are drained.
Wear eye protection when disconnecting air lines to prevent injury.
c.
Tag and disconnect air lines (1, 2, and 3, Figure 2-1-13) from connectors (8, 9, and 10).
d.
Unscrew TRAILER AIR SUPPLY knob (4) and PARKING BRAKE knob (5) from control assembly (7).
e.
Support control assembly (7), remove screws (6) and control assembly (7) from dash panel.
f.
If necessary, remove connectors (8, 9, and 10) from control assembly (7).
Repair
WARNING
Be careful to maintain and release pressure slowly when removing retaining
caps. Internal components are assembled with spring tension and could cause
personal injury if allowed to pop free.
a.
Remove retaining caps (11, Figure 2-1-13) from control body (33).
b.
Remove holders (12), spools (13), seals (14), and springs (15) from control body (33). Discard seals and
springs.
c.
Remove o-rings (16 and 17) from holders (12). Discard o-rings.
d.
Remove o-rings (18, 19, and 20) from spools (13). Discard o-rings.
NOTE
If spools show excessive wear or damage, do not proceed with remaining
steps. Control assembly (7) must be replaced.
WARNING
Be careful to maintain and release pressure slowly when removing retaining
plug. Internal components are assembled with spring tension and could cause
personal injury if allowed to pop free.
e.
Remove retaining plug (21) from control body (33).
2-1-73
