TM 5-4310-385-13
INSPECTION.
NOTE
Air tank should be under pressure to check action of check valve.
a.
Run compressor until unit kicks off (tank pressure close to 190 psi).
b.
Turn compressor switch OFF.
c.
Air pressure in aftercooler tubing (1) should have been released to unloader line (2) upon compressor shutdown.
CAUTION
Loosen fitting slowly. Do not remove until air has escaped.
d.
Loosen aftercooler tubing fitting (3) and wait for any air release. Remove aftercooler tubing.
e.
Remove unloader line (2) from check valve (4).
f.
Apply soap solution to check valve (4) and check for leaks. If bubbles appear, repair or replace check valve.
Refer to following paragraphs.
REMOVAL
WARNING
Disconnect main power and turn compressor unit off before performing
maintenance procedures.
a.
Disconnect main power and turn compressor switch OFF.
WARNING
Air pressure in tank must be discharged before removal of check valve. Removal
under pressure could cause serious injury.
b.
Open drain cock and completely release tank pressure. Close drain cock.
c.
Disconnect aftercooler tubing fitting (3) from check valve (4).
d.
Remove pipe.
e.
Disconnect unloader line (2) from check valve (4).
f.
Unscrew check valve (4) from tank.
DISASSEMBLY.
a.
Remove retaining ring (5) from body (6).
b.
Remove brass seat (7), spring (8), and teflon poppet (9).
c.
Replace poppet (9) if worn or pitted.
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