Isuzu Ascender 2003-05

Air Spring

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Removal & Installation



  1. Remove the air suspension system fuse.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Raise and support the rear axle at the designed D-height.
  6.  
  7. Remove the air compressor mounting bolts from the frame and support air compressor.
  8.  
  9. Loosen both of the air supply line connections at the air compressor in order to depressurize the air springs.
    NOTE
    After the air suspension has been depressurized, DO NOT allow the vehicle to be completely lowered onto the rear jounce bumpers.


    NOTE
    There is a raised feature on the outer rim of the air spring top plate that denotes the anti rotation peg position.



    Click image to see an enlarged view

    Fig. Air compressor

  10.  
  11. Depress the anti rotation peg (2) in the air spring top plate located in the upper spring seat.
  12.  
  13. With the anti rotation peg (2) depressed, rotate the air spring counterclockwise and remove the air spring from the upper spring seat.
  14.  
  15. Disconnect the air supply line from the air spring in the following way.
    1. Push the air supply line into the air spring connection and hold in place.
    2.  
    3. Depress and hold the air supply line collet (2) down.
    4.  
    5. Remove the air supply line (1) from the air spring.

      Click image to see an enlarged view

      Fig. Air spring and supply line

    6.  

  16.  
  17. Remove air spring from vehicle.

    Click image to see an enlarged view

    Fig. Air spring removal

  18.  

To install:

  1. Install the air supply line to the air spring. Ensure the air supply line is fully seated.
  2.  
  3. Install the air spring (2) to the frame by aligning the mounting tabs (3) with the keyhole slots (1) in the upper spring seat.
  4.  
  5. Apply upward pressure to the air spring (2) and rotate clockwise until the anti rotation peg snaps into place.
  6.  
  7. Tighten air supply lines to the compressor.
  8.  
  9. Tighten the air supply lines to the air compressor to 20 inch. lbs. (2.25 Nm)
  10.  
  11. Install the air compressor and frame mounting bolts.
  12.  
  13. Tighten the air compressor mounting bolts to the frame to 15 ft. lbs. (20 Nm)
  14.  
  15. Lower the vehicle slightly below the correct D-height position.
  16.  
  17. Install the air suspension system fuse.
  18.  
  19. Turn ON the ignition, engine OFF. Allow the air suspension compressor to run for approximately 1 minute to ensure that the air suspension is functioning properly.
  20.  

 
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