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REPAIR - TM-5-4210-220-12_508
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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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Purge  Valve  and  Exhaust  Diaphragm  Repair  - Continued
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued (2) Tag and disconnect the heater wire. (3) Loosen   the   three   capscrews   (2)   on   the end  cover  and  turn  the  retaining  clamps (1) aside (capscrews may be left fingertight). (4) Locate   the   notch   in   the   dryer   shell   (4). While  pushing  the  end  cover  (3)  up  into the drier, insert the blade of a screwdriver in    the    notch    and    slowly    pry    out    the retainer  ring  (6).    Remove  the  end  cover assembly. (5) Remove  and  discard  the  large  O-ring  (5) around the end cover assembly. (6) If the heater element has failed, the whole end  cover  assembly  should  be  replaced. For purge valve repair see d following. (7) Lubricate  and  install  the  new  O-ring  (5) around the end cover assembly. (8) Push the end cover up into the body and install  the  retaining  ring  (6).    Be  sure  the gap  in  the  ring  is  within  1  in.  (2.5  cm)  of the notch in the body. (9) Locate retaining clamps (1) and tighten capscrews (2). (10) Test air drier as detailed in INSTALLATION, steps 5 thru 17, preceding. d.  Purge Valve and Exhaust Diaphragm Repair NOTE These  may  be  repaired  with  drier on truck. Ensure    air    tanks    are    drained    prior    to repair. (1) Remove   end   cover   as   detailed   in   End Cover Repair, steps 1 thru 5, preceding. (2) Remove the single screw (1) securing the exhaust    diaphragm    and    separate    the diaphragm (3), washer (2), and screw (1). Discard the diaphragm. (3) Remove the three screws (4) securing the exhaust   cover   and   remove   the   exhaust cover (5). (4) Remove  the  purge  valve  assembly  and the  large  hex  cap  nut  (9)  from  the  end cover.    Discard  both  O-rings  (10  and  11) around the cap nut. 4-383

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