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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
2-13.9
Non-Return Valve.
This task covers
Repair
TOOLS
MATERIALS/PARTS
Shop Equipment, Automotive
27, Appendix B Silicone Grease
Maintenance and Repair,
WRP 7973 Gasket
NSN 4910-00-754-0705
WRP 7993 O-ring
EQUIPMENT CONDITION
Main Engine Shutdown
(see TM 5-4210-220-12)
APU Shutdown
(see TM 5-4210-220-12)
Batteries Disconnected
(see TM 5-4210-220-12)
Pump Access Panels Removed
REPAIR
(1)
Loosen hose clamp (13) and pull hose (14) from non-return valve.
(2)
To
disassemble
the
non
return
valve
assembly, remove the three nuts (1),
lockwashers (2), and flatwashers (3).
(3)
Remove the body (4) from mounting studs
(9). Remove gasket (5) and discard.
(4)
Pull non-return valve (8), spring (10), and
spring retainer (11) from primer bearing
housing (12).
(5)
Remove O-ring (7) from non return valve
and discard.
(6)
Examine body (4) and valve sleeve (6) for
cracks,
corrosion
or
warped
mounting
flange.
(7) Lubricate new O-ring (7) using silicone grease (item 27, Appendix B) and install O-ring onto non-return valve
(8).
(8)
Install spring retainer (11), spring (10), and non-return valve (8) into the primer bearing housing (12).
(9)
Install new gasket (5), valve sleeve and body (4) onto studs (9).
(10) Install three flatwashers (3), lockwashers (2) and nuts (1) onto studs (9). Torque nuts to 24 ft lb (33 Nm).
(11) Test fire pump as detailed in para. 2-13.14.
2-111
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