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repair (cont) - TM-5-4210-220-12_513
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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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Fuel Tank - TM-5-4210-220-12_515
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued 4-22.13 Air Lines and Piping This task covers Replacement TOOLS MATERIALS/PARTS Shop Equipment, Automotive 22, Appendix E, Pipe Sealant Maintenance and Repair. NSN 4910-00-754-0705 EQUIPMENT CONDITION Main Engine Shutdown (see para. 2-10) APU Shutdown (see para. 2-12) Batteries Disconnected (see para. 4-24) Truck Wheels Blocked All Air Tanks Drained WARNING Death  or  serious  injury  could  occur  if  compressed  air  is  directed  against  the  skin.    Always drain all air tanks via the draincocks prior to replacing any air line or pipe. REPLACEMENT (1) Disconnect  both  ends  of  air  line  that  has  failed.    Use  the  air  schematics  in  Appendix  H  as  a  guide  to determine location of both ends. (2) For tubes with compression fittings, thread a new piece of brake tubing between the two connectors.  Be sure the tubing follows the same routing as the failed tube. (3) Cut tube from roll and fit new nut and sleeve on both ends of the tube.  Coat threads of connector with pipe sealant (item 22, Appendix E), and tighten nut onto connector. (4) All connectors should be tightened approximately two turns beyond hand tight. (5) Lay new tube in harness and if necessary strap in place with tie wraps.  Be sure tube is supported at least every 2 - 3 ft (0.6 - 0.9 m). (6) Be sure tube does not come any closer than 1 in. (25 mm) to any moving or hot part. (7) When  tube  is  installed,  reconnect  truck  batteries  and  start  main  engine.    When  air  line  is  pressurized brush both connectors with soap solution to check for leaks.  Tighten/remake connections as required. (8) For  hoses  with  flared  connectors,  lay  out  and  cut  new  hose  as  above.    Remove  hose  and  fit  new connectors to each end as detailed in para. 4-9.  Be sure same type of connectors are used. (9) Install hose assembly in truck and carry out instructions 4 thru 7 preceding. (10) Remove old air line or pipe from truck, or, if in a harness, cut back to the harness from both ends so that failed line or pipe will not be used subsequently. 4-388/(4-389 Blank)

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