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TM 9-2320-360-20-1 1-17.  AIR SYSTEM The  air  system  operates  the  service  and  parking  brakes,  rear  suspension  system,  and  the  CTIS.    The  air  system  also enables  operation  of  the  transfer  case  and  interaxle  lockups,  winch  tensioners  and  kickouts,  windshield  washer,  and horns. The  air  system  on  the  HET  Tractor  consists  of  an  engine-driven  air  compressor  (1),  a  purge  tank  (2),  and  five  air reservoirs (3 thru 7).  Reservoir (3) supplies air to reservoirs (4 thru 7).  Three reservoirs (5 thru 7) are interconnected and separated  from  reservoir  (4)  with  check  valves.    Air  from  reservoir  (4)  is  supplied  to  service  brakes  on  all  four  axles  and parking  brakes  on  the  rear  tridem  axles,  transfer  case  and  interaxle  lockups,  winch  tensioners  and  kickouts,  windshield washer,  and  horns.    The  service  brakes  are  actuated  by  relay  valves  which  are  controlled  by  the  operator  pressing  the brake treadle in the cab.  The parking brakes are also actuated by relay valves which are controlled by hand controls.  In the event of the loss of system air pressure, the spring brake valve will modulate the parking brakes so the HET Tractor can  be  stopped  safely.    Reservoirs  (5  thru  7)  supply  air  to  operate  the  CTIS,  service  and  parking  brakes  on  rear  tridem axles, and rear suspension system.  Air is drawn from the engine air intake and routed to the air compressor (1) where it is  pressurized.    Air  dryers  (8  and  9)  remove  moisture  from  the  pressurized  air.    Air  from  the  dryers  goes  to  the  purge reservoir (2) and air reservoir (3). System  protection  elements  include  an  air  cleaner  restriction  indicator  (10)  that  determines  whether  air  flow  through  the air cleaner is impeded.  In the cab, air pressure in reservoir (4) is indicated by the green needle on the AIR PRESSURE gage (11).  The red needle on the gage (11) indicates air pressure in reservoirs (5 thru 7).  If air pressure falls below 60 psi (414 kPa) in any of the reservoirs, warning alarm will sound and LOW AIR indicator will light. The  rear  suspension  system  contains  a  pair  of  suspension  air  springs  on  each  rear  axle  that  automatically  inflates  or deflates according to load.  Air to the air springs is regulated by a height control valve. Purging  the  air  in  the  air  dryers  is  automatically  done  when  125  psi  (862  kPa)  system  pressure  is  reached  at  the compressor.  The compressor cycle is stopped and air from purge tank clears accumulated water through a valve on the bottom of the air dryer. Air to the transfer case enables engagement of four-wheel drive in high or low gear range.  An interaxle lockup pilot valve also prevents the axles from locking up in high ranges. 1-8  Change 1

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