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Priming Valve Repair
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR (cont) - TM-5-4210-220-34_116
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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