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INSTALLATION - TM-5-4210-220-12_507
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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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End Cover Repair
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued 4-22.12  Air Drier - Continued REPAIR a. Safety Valve Repair NOTE Safety  valve  cannot  be  repaired,  it  must  be  replaced.    It  may  be  replaced  with  the  drier mounted on the truck.  Ensure all air tanks are drained prior to safety valve repair. (1) Unscrew safety valve from elbow on side of drier and discard. (2) Coat new safety valve threads with pipe sealant (item 22, Appendix B) and screw onto elbow. (3) Test air drier as detailed in INSTALLATION, steps 5 thru 17, preceding. b. Check Valve Repair NOTE Check valve cannot be repaired, it must be replaced.  It may be replaced with drier on truck. Ensure all air tanks are drained prior to check valve repair (1) Remove  outlet  air  line  (1)  from  air  drier and remove outlet fitting (2). (2) Unscrew check valve (3) from air drier. (3) Coat  threads  of  new  check  valve  and  air line   fitting   with   pipe   sealant   (item   23, Appendix    B).        Be    sure    O-ring    is    on external threaded portion of check valve. (4) Reinstall the check valve in the outlet port and reconnect the air line. (5) Test air drier as detailed in INSTALLATION, steps 5 thru 17, preceding. c. End Cover Repair NOTE This may be repaired with drier on truck.  Ensure all air tanks are drained prior to end cover repair. (1) Tag and disconnect the air line from the end cover and mark location of this port on the drier. 4-382

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