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REPAIR - TM-5-4210-220-12_599
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPAIR (cont) - TM-5-4210-220-12_601
TM 5-4210-220-12 4-25.  STEERING SYSTEM - Continued (3) Inspect valve cover bore.  If scratched or otherwise damaged, replace the valve cover.  Do not attempt to repair. NOTE During  handling  and  shipping  of  new  relief  valve,  burrs  may  be  raised  on  sharp  edges.    Be sure to remove these burrs before installing relief valve. (4) Coat the new relief valve with lubricating oil (item 17, Appendix E) and install it in the valve cover, small land first. (5) Check the valve slides smoothly in the valve bore and install spring (4). (6) Apply pipe sealant (item 22, Appendix E) to plugs (1) and (3) and install in valve cover. c. Pump Cartridge Repair NOTE Pump must be removed from truck.  See REMOVAL preceding. (1) Remove cover screws (1).  Note position of cover ports with respect to body port and lift off cover (2) and O-ring (6). (2) Remove pressure plate (4) and spring (3). (3) Note position of ring (7) with respect to body (12).  Also note the direction of the arrow on the ring.  Lift ring free of pump body (12).  Remove and discard gasket (10). (4) Remove vanes (9) from rotor and pull rotor (8) off pump shaft. (5) Remove pressure relief valve from valve cover (see b. preceding). WARNING Dry  cleaning  solvent  P-D-680  (safety  or  Stoddard's  solvent)  is  potentially  dangerous.   Avoid repeated and prolonged breathing of vapors and skin contact with the liquid.  Do not use near open  flame,  arcing  equipment  or  other  ignition  sources.    Always  wear  eye  protection  and protective clothing.  The flash point of P-D-680 is 100 to 138 deg. F (30 to 59 deg. C). Death or serious injury could occur if compressed air is directed against the skin.  Do not use compressed air for cleaning or drying unless the pressure is/has been reduced to  30  psi  (2.11  kg/cm2)  or  less.    When  working  with  compressed  air,  always  use  chip guards, eye protection, and other personal protective equipment. (6) Using   dry   cleaning   solvent   (item   10   Appendix   E),   wash   all   parts   thoroughly   and   blow   dry   using compressed air. (7) Inspect rotor (8) and vanes (9).  Replace both if excessive play is noticed between vanes and slots in rotor. 4-479

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