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TM 9-2330-272-14
4-62. MANHOLE COVER MAINTENANCE (M131A4 AND M131A4C) (Con’t).
3.
Shake vent valve and listen for rattling sound. If rattling does not occur, vent valve is clogged with debris and
must be replaced.
4.
Apply gentle pressure through threaded end of vent valve on valve disc. Disc should be free to move
approximately ¼in. (6.35 mm). If disc movement is not smooth, vent valve is nonfunctional and must be
replaced.
d .
ASSEMBLY
Install washer (9), fill cover (8), new gasket (7), and retainer (6) on manhole cover (12) with vent valve (5).
e.
INSTALLATION
1.
Position new gasket (11) and manhole cover (12) on semitrailer (10).
2.
Install ring (4) on manhole cover (12) with bolt (1), washer (2), and nut (3)
4-127
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