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Air Starter Valve
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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_487
TM 5-4210-220-12 4-22 AIR SYSTEM - Continued (3) Install air lines A, B, and C (4) Start main engine and allow all air tanks to fill with air (5) Brush   valve   body   and   connectors   with   soap   solution.      No   leakage   is   permitted.      Tighten/replace connectors as required. (6) Shut down main engine and drain primary air tank (left rear wheel well) (7) Restart  main  engine  while  monitoring  cab  primary  air  pressure  gage.    Check  that  as  soon  as  ignition switch is operated and prior to engine start, the primary air tank is pressurized to at least 50 psi (340 kPa) as a result of the air starter valve operating. (8) Replace front wheel and cab skid plate if required REPAIR NOTE The  air  starter  valve  can  only  be  repaired  if  it  is  removed  from  the  truck.    See  REMOVAL preceding. (1) Pull off boot (1) (2) Push down on valve guide (3) and remove retaining ring (2) Be aware that valve guide is spring loaded (3) Remove   valve   guide   (3)   and   push   out supply  valve  (7)  and  spring  (5)  from  body (9) (4) Remove   and   discard   O-ring   (4),   supply valve (7), retaining ring (2), and boot (1) (5) Clean and Inspect all remaining components.  Check for burrs, scuff marks or other deterioration. Replace any components failing inspection. (6) Coat  all  O-rings  and  sliding  surfaces  with petroleum jelly (item 21, Appendix E). (7) Slide   new   supply   valve   (7)   carefully   into body.      Be   sure   lower   O-ring   (8)   is   not scuffed as it passes the delivery port. (8) Install spring (5) (9) Install  new  O-ring  (4)  on  valve  guide  (3) and  push  carefully  over  supply  valve  and into body.  Retain with ring (2). 4-359

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