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Page Title: MANUALLY RELEASING AND RESETTING SPRING BRAKES
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TM 9-2320-270-10 MANUALLY  RELEASING  AND  RESETTING  SPRING  BRAKES An  air  system  pressure  loss  to  below  60  psi  (414  kPa)  will  allow  spring  brake  units  on  the tandem  rear  axles  to  apply  the  rear  brakes.  To  move  the  M911  Truck  Tractor,  the  power springs in the spring brake chambers must be compressed. When there is not enough air pres- sure,  the  springs  must  be  compressed  and  reset  manually.  This  is  done  in  the  following  steps: Releasing Brakes by Compressing Spring Brake Power Springs 1. 2. 3. 4. 5. WARNING Failure  to  block  wheels  before  releasing  the  spring  brakes  could  result  in  vehicle runaway,  causing  injury  to  personnel  and  damage  to  equipment. NOTE There  are  four  spring  brake  chambers  on  the  M911  Truck  Tractor,  There  is one  left  and  one  right  forward  of  front  tandem  axle,  and  one  left  and  one right  behind  rear  tandem  axle.  All  four  spring  brake  chambers  operate  the same.  Only  the  right  rear  is  addressed  below. Chock  wheels. Open  two  hinged  handles  (1)  on  spring  brake  chamber  (2). Rotate  handles  (1)  clockwise  until  center  bolt  head  (3)  sticks  out  about  4  inches (10  cm)  or  reaches  stop. Release and fold handles. Repeat  steps  2,  3  and  4  for  remaining  three  spring  brake  chambers  (2). Resetting Brakes by Releasing Spring Brake Power Springs 1. 2. 3. 4. 5. Open  two  hinged  handles  (1)  on  spring  brake  chamber  (2). Rotate  handle  (1)  counterclockwise  until  center  bolt  (3)  is  flush  with  top  of  hex nut   (4). Fold  hinged  handles  (1)  over  hex  nut  (4). Repeat  steps  1,  2,  and  3  for  remaining  three  spring  brake  chambers  (2). Remove  chocks. 2 - 1 2 2

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