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REPAIR (cont) - TM-5-4210-220-34_116
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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repair - TM-5-4210-220-34_118
TM 5-4210-220-34 2-13. FIRE PUMP - Continued 2-13.11 Disengaging Unit. This task covers Repair TOOLS MATERIALS/PARTS Shop Equipment, Automotive 22, Appendix B Pipe Sealant Maintenance and Repair, UFP 2290 O-ring NSN 4910-00-754-0705 UFP 5954 Diaphragm EQUIPMENT CONDITION Fire Pump Removed from Truck (see TM 5-4210-220-12) REPAIR NOTE If disengaging unit diaphragm is damaged,   water   will   be   seen   dripping from disengaging unit upper flange. (1) Loosen  gear  clamps  (1)  and  remove  hose (2)   from   between   suction   elbow   (3)   and priming valve (4). (2) Disconnect     and     remove     priming     return spring (5). (3) Swing   the   water   ring   primer   (6)   upwards, and  allow  it  to  hang  by  the  fulcrum  pin  on the front of the pump. (4) Disconnect  the  union  nut  (10)  on  the  under side of the disengaging unit (7). (5) Unscrew  the  disengaging  unit  (7)  from  the bearing housing. (6) Remove lift-off pipe (11) if necessary.  If lift- off pipe is removed, pull washer (12) and O- ring  (13)  from  pump  body.    Replace  O-ring (13). (7) To disassemble disengaging unit, first remove  circlip  (15)  and  washer  (16).    Pull plastic cap (17) from diaphragm cover (23). (8) Remove six nuts (19), lockwashers (20) and flatwashers (21). (9) Separate the diaphragm cover (23) from the diaphragm housing (28). 2-116

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