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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Priming Valve Repair
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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