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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
The procedure below describes priming valve repair with the pump removed.
(1)
Remove primer suction pipe as detailed in para. 2-13.1.
(2)
Loosen gear clamps (1) and remove hose (2).
(3)
Remove four capscrews (3) and nuts (4). Remove priming valve (6) from bracket (5).
(4) To disassemble the priming valve, unscrew the three nuts (7), lockwashers (8), flatwasher (9), and capscrews
(10).
(5)
Carefully separate the end plates I11 and 12) from body (13). Remove gasket (14) and discard.
(6)
With end cover (12) removed, examine diaphragm (15) for deterioration or cracks.
(7)
If diaphragm (15) is damaged, it can be replaced when seal washer (16) is inspected.
(8)
To remove seal washer (16), support capscrew (17) and remove self-locking nut (18). Remove bonded seal
(19), washer (20), seal washer (16) and washer (21).
(9)
Pull remaining components through body (13). Remove spacer (12), spring (23), diaphragm plate (24) and
diaphragm (15) from capscrew (17). Slide washer (25) and bonded seal (26) from capscrew (17).
(10) Examine the seal washer (21) and valve seat for contamination. Replace seal washer as necessary.
(11) Inspect end plates (11 and 12) for cracks, corrosion or warped flanges. Clean end plates (11 and 12) and
body (13) mating surfaces.
(12) Examine hose connections for excessive contamination or cracks. Replace body as necessary.
(13) To assemble, slide bonded seal (26) and washer (25) onto capscrew (17).
(14) Install new diaphragm (15) on capscrew (17). Install diaphragm plate (24), spacer (22), and spring (23) onto
capscrew (17).
(15) Install partial assembly into body (13). Make sure the spring (23) contacts the seat in the body.
(16) Install washer (21), seal washer (16), washer (20), bonded seal (19) and new locknut (118).Torque locknut to
44 ft lb (60 Nm).
(17) Apply gasket eliminator (item 14, Appendix B) to both faces of gasket (14).
(18) Aline end plate (11), gasket (14), body (13), diaphragm (15), and end plate (12).
(19) Install three capscrews (10) through end plates (11 and 12) and valve body (13). Install flatwashers (9),
lockwashers (8) and nuts (7) onto capscrews (10). Torque nuts (7) evenly to 44 ft lb (60 Nm).
2-113
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