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Air Drier
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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_508
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued (2) Raise drier and install on frame using capscrews (2) and locknuts (3). (3) Connect air lines to drier.  Be sure they are connected as noted in REMOVAL preceding. (4) Connect wire (1) to terminal of heater. (5) Connect the batteries and start the main engine.  Allow pressure to build up to governor cut-out.  Shut main engine down. (6) Wait two minutes and observe the primary air pressure gage in the cab if this pressure continues to drop, check for air leakage from the drier purge valve.  If air is leaking, this indicates a failed check valve in the outlet port of the air drier.  Replace check valve as detailed in REPAIR following. (7) Restart main engine and drain air from the primary air tank until the compressor restarts compressing. (8) Check for excessive leakage from the purge valve by brushing the purge valve with soap solution.  Brush all fittings similarly. (9) Replace/tighten fittings as required or replace purge valve as detailed in REPAIR following. (10) Check operation of the drier safety valve by pulling on exposed stem.  Air must exhaust while the stem is held and should reseat when released.  Replace as detailed in REPAIR following if test is unsatisfactory. (11) Check that, when ignition is on, the heater terminal is at 12 volts with respect to the drier shell.  If not, check breaker behind hinged dash panel and wire between breaker and drier. (12) Turn  the  ignition  switch  off  and  cool  the  end  cover  assembly  to  less  than  40  deg.  F  (4  deg.  C).    With  an ohmmeter  check  resistance  between  electrical  terminal  and  the  aluminum  of  the  end  cover.    Resistance should be 2.0 - 4.0 ohms. (13) Warm  the  end  cover  to  over  90  deg.  F  (32  deg.  C)  and  check  resistance  as  above.    Resistance  should exceed 1000 ohms. (14) If the resistance is outside these limits, carry out test 15, 16, and 17. (15) With the ignition switch off, remove the thermostat cover by removing screws. (16) Check  resistance  between  aluminum  of  the  end  cover  and  heater  post.    If  not  between  2.0  -  2.8  ohms replace  the  end  cover  assembly  as  detailed  in  REPAIR  following  (the  heater  has  failed  but  cannot  be replaced  alone).    If  the  heater  resistance  is  within  these  limits,  the  thermostat  has  failed.    See  REPAIR following. (17) Run  the  truck  as  normal  and  check  for  moisture  build  up  in  the  tanks  daily.    Replace  desiccant  if  there  is evidence of moisture in the air tanks. 4-381

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