Bendix AD-9

rv mm 42.03.000

Note: Desiccant change intervals may vary from vehicle to vehicle. Typical desiccant cartridge life is three years. However, if experience has shown that extended or shortened life has resulted on a particular installation, then the interval can be increased or decreased accordingly.

  1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
  2. Completely drain all air reservoirs. Air pressure gauges should read 0 psi (0 kPa).
  3. Loosen the desiccant cartridge with a strap wrench at the base of the cartridge. Spin off the cartridge and discard it.
  4. Remove the O-ring from the threaded neck and discard it.
  5. Remove the coalescent filter and discard it.

    6. Important: Lubricate the new O-rings prior to installation.

  6. Install the new small O-ring in the groove on the bottom of the new coalescent filter.
  7. Insert the coalescent filter with the O-ring end going into the air dryer opening first. The end of the filter with the "X" will then be facing out.
  8. Install the other new O-ring over the threaded neck of the desiccant cartridge.
  9. Screw on the desiccant cartridge until resistance is detected. Then, tighten the cartridge 1/4 to 3/4 of a turn by hand.
  10. Before placing the vehicle in service, perform the test below.
    1. Start the engine and build air pressure to 120 psi (827 kPa).
    2. Listen for the purge valve to open and release air. A large volume of air will be expelled, followed by a slow flow of air lasting approximately 30 seconds.
    3. Shut down the engine.
    4. Perform the inspections in Air Dryer Checking Procedures.
Note:
Parent topic: Replacing the Air Dryer Desiccant and Coalescent Filter
Document Number: 0000120632
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-11-13