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TM 5-4210-220-12
4-22. AIR SYSTEM - Continued
4-22.12 Air Drier - Continued
REPAIR
a.
Safety Valve Repair
NOTE
Safety valve cannot be repaired, it must be replaced. It may be replaced with the drier
mounted on the truck. Ensure all air tanks are drained prior to safety valve repair.
(1)
Unscrew safety valve from elbow on side of drier and discard.
(2)
Coat new safety valve threads with pipe sealant (item 22, Appendix B) and screw onto elbow.
(3)
Test air drier as detailed in INSTALLATION, steps 5 thru 17, preceding.
b.
Check Valve Repair
NOTE
Check valve cannot be repaired, it must be replaced. It may be replaced with drier on truck.
Ensure all air tanks are drained prior to check valve repair
(1)
Remove outlet air line (1) from air drier
and remove outlet fitting (2).
(2)
Unscrew check valve (3) from air drier.
(3)
Coat threads of new check valve and air
line fitting with pipe sealant (item 23,
Appendix B). Be sure O-ring is on
external threaded portion of check valve.
(4)
Reinstall the check valve in the outlet port
and reconnect the air line.
(5)
Test
air
drier
as
detailed
in
INSTALLATION,
steps
5
thru
17,
preceding.
c.
End Cover Repair
NOTE
This may be repaired with drier on truck. Ensure all air tanks are drained prior to end cover
repair.
(1)
Tag and disconnect the air line from the end cover and mark location of this port on the drier.
4-382
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