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Air Regulators
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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 - TM-5-4210-220-12_483
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued Rear brake air regulator setting  45 psig (379 kPa) CFR water pressure/air regulator setting:75 psig (517 kPa). Throttle Regulator setting: None; Pressure should increase gradually as valve handle is turned. (5)    When the set pressure is reached, pressurize  supply  side  to(set  pressure  +10 psig (70 kPa)) and hold this pressure for 10 minutes.      Ensure   delivery   side   pressure does   not   increase   more   than   2   psig   (14 kPa) during this time (6)    Depressurize  both  sides  of  the  valve  and remove the gages, draincock and temporary air supply (7)    Install  regulator  in  truck  using  capscrews. Install  air  lines  and  fittings  as  removed  In step  1  of  REMOVAL  preceding.    Coat  all threads with pipe sealant (item 22, Appendix E) prior to installation. (8)    For   each   brake   regulator   truck   test,   start main engine and with truck fully loaded with all  normal  auxiliary  equipment,  water  and foam,  drive  truck  on  test  truck  to  30  mph (50  kph).    Brake  hard  and  ensure  neither front    wheels    nor    rear    wheels    lock    up preferentially.      If   rear   wheels   lock   first, reduce  pressure  through  regulator    If  front wheels lock first, increase pressure through regulator.    Repeat  the  test  until  both  axles lock up simultaneously. (9)    For  the  CFR  water  pressure/air  regulator, start   the   CFR   fire   system   as   detailed   in para. 2-11 (10)    With   water   discharging   through   the   roof turret, adjust the air regulator until the pump discharge pressure is 225 psig (1550 kPa). When  the  air  regulator  is  set  up  correctly shut down the fire pump as detailed in para. 2-11 (11)    For the throttle regulator, start the fire pump in the structural mode as detailed in para.2- 11.    Operate  the  throttle  and  check  engine speed Increases gradually from 800 rpm to 2250  rpm.    While  adjusting  be  sure  pump pressure  does  not  exceed  250  psig  (1700 kPa). (12)    When throttle has been checked shut down the fire system as detailed In para. 2-11. Change 6 4-355

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