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Disengaging Unit
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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_119
TM 5-4210-220-34 2-13. FIRE PUMP - Continued (10)  Examine diaphragm(25) for splits, or deterioration. (11)  Remove    damaged    diaphragm    (25)    from plunger    (18)    by    removing    nut    (27)    and washer     (26).          Make     sure     to     remove diaphragm plate (24), located on diaphragm cover (23) end of plunger.  Pull plunger from diaphragm cover. (12)  Inspect   diaphragm   cover   and   housing   for cracks,    excessive    corrosion,    or    warped mating surfaces. (13)  Inspect    diaphragm    housing    for    stripped threaded holes, and stripped water connection threads. (14)  Inspect diaphragm cover for oblong plunger hole. (15)  Examine    plunger    for    excessive    wear    or corrosion. (16)  Evidence of damage of any kind is cause for rejection.  Replace component or assembly as required. (17)  Install   plunger   (18)   into   diaphragm   cover (23). (18)  Slide   diaphragm    plate    (24)    onto    plunger (18). (19)  Install new diaphragm (25) and washer (26). Apply a thin coating of pipe sealant (item 22, Appendix B) to plunger threads.  Thread nut (27) onto plunger and tighten to 24 ft lb (33 Nm). (20)  Aline  diaphragm  (25)  and  diaphragm  cover (23) mounting holes. Carefully slide diaphragm   onto   diaphragm   housing   studs (22).  Secure diaphragm cover to diaphragm housing using flat washers (21), lockwashers   (20),   and   nuts   (19).   Torque nuts to 24 ft lb (33 Nm). (21)  Position plastic cap (17) and washer (16) on diaphragm  cover  (23)  and  lock  in  position with circlip (15). (22)  Thread   disengaging   unit   (7)   into   bracket (14). (23)  Install washer (12) and new O-ring (13) onto lift-off   pipe   (11).      Position   lift-off   pipe   in pump head pressure socket. 2-117

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