TM 5-4310-384-13
CAUTION
Loosen fitting slowly. Do not remove until air has escaped.
d.
Loosen aftercooler tubing fitting (2) and wait for any air release. Remove aftercooler tubing.
e.
Remove unloader line (1) from check valve (3).
f.
Listen for any leakage of air from check valve (3). If leak is audible, 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 (2) from check valve (3).
d.
Remove pipe.
e.
Disconnect unloader line (1) from check valve (3).
f.
Unscrew check valve (3) from tank.
DISASSEMBLY.
a.
Remove retaining ring (4) from body (5).
b.
Remove brass seat (6), spring (7), and teflon poppet (8).
c.
Replace poppet (8) if worn or pitted.
ASSEMBLY.
a.
Install poppet (8), spring (7), and seat (6) into body (5).
b.
Install retaining ring (4).
c.
Check that seat and poppet assembly move freely and seat against body dashpot.
INSTALLATION.
a.
Coat threads with anti-seize tape and install check valve (3) in tank and tighten.
b.
Connect unloader line (1) to check valve (3).
c.
Connect aftercooler tubing fitting (2) to check valve (3).
d.
Check that drain cock is closed.
e.
Connect main power.
f.
Run compressor and check fittings for air leaks.
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