TM 5-4320-302-14
Table 4-1. Organizational Preventive Maintenance Checks and Services
W-Weekly
Q-Quarterly
M-Monthly
S-Semiannually
INTERVAL
ITEM
NO.
W
M
Q
S
ITEM TO BE INSPECTED
PROCEDURES
9
Check Valve
Inspect check valve body assembly for cracks or damaged
Assembly
threads. Check that attaching hardware is tight and free of
corrosion.
Inspect check valve assembly for evidence of leakage or gasket
damage, and presence of outer check valve weight. Machine
screw should be tight. All components must be free of corro-
sion. When in closed position, check valve gasket flapper
must make an airtight seal on pump outlet. Be sure valve
gasket flapper is free to open with pump flow.
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