TM 9-2330-384-14&P
4-67. MANHOLE AND FILL COVER MAINTENANCE (Con't).
c. REPLACEMENT OF VENT ASSEMBLY
NOTE
Manhole has two vent assemblies in fill cover (10): one vacuum vent (6) and
one pressure/vacuum vent (9). Replacement procedures are the same.
(1)
Open fill cover (10) (see paragraph 2-16).
(2)
Remove vent (6 or 9) and gasket (5). Discard gasket.
NOTE
Ensure that fill cover (10), where gasket (5) is to be installed, is free of
nicks, rust, or dirt.
(3)
Install new gasket (5) and vent (6 or 9) in fill cover (10).
(4)
Close fill cover (10) (see paragraph 2-16).
d. FILL COVER ADJUSTMENT
(1)
Open fill cover (10) (see paragraph 2-16).
(2)
Loosen nut (8) on underside of fill cover (10).
(3)
With fill cover (10) closed, loosen or tighten bolt (17) in center of strongback (18) until latch
(12) just clears the secondary latch on strongback.
(4)
Open fill cover (10) and tighten nut (8), making sure that bolt (17) does not turn.
(5)
Close fill cover (10) and check clearances of latch (12) and secondary latch on strongback
(18).
(6)
If damage is found to fill cover adjustment components, replace (see REPLACEMENT OF FILL
COVER ADJUSTMENT COMPONENTS, subparagraph e).
e. REPLACEMENT OF FILL COVER ADJUSTMENT COMPONENTS
(1) Open fill cover (10) (see paragraph 2-16).
(2)
Remove nut (8) from underside of fill cover (10). Remove bolt (17) from top while strongback
(18) is open. Remove spring (11).
(3)
Install bolt (17) through strongback (18). Position replacement spring (11) and fill cover (10)
against strongback and tighten bolt.
(4)
Perform step 3 of FILL COVER ADJUSTMENT, subparagraph d.
(5) Install nut (8).
(6)
Close fill cover (10) (see paragraph 2-16).
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