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TM 9-2330-272-14
4-63. MANHOLE COVER MAINTENANCE (M131A5 AND M131A5C) (Con't)
3. Shake vent and listen for ratting sound. If ratting does not occur, vent is clogged with debris and must be
replaced.
4. Apply gentle pressure through threaded end of vent on valve disc. Disc should be free to move approximately
¼in. (6.35mm). If disc movement is not smooth, vent is nonfunctional and must be replaced.
1. Install new gasket (7) and vent (9) on fill cover (8).
2. Install spring (5) and fill cover (8) on manhole cover (13) with adjusting screw (15) and new locknut (6).
3. Perform adjustment (subpara a).
1. Position new gasket (11) and manhole cover (13) on semitrailer (12).
2. Install clamp ring (4) on manhole cover (13) with screw (1), washer (2), and nut (3).
4-129
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