AD–IP Air Dryer

s2 m 42.01.001
  1. Park the vehicle on a level surface and apply the parking brake. Shut down the engine. Chock the tires.
  2. Completely drain all air reservoirs. Air pressure gauges should read 0 psi (0 kPa).

    3. Important: The compressor discharge line may contain residual air pressure.

  3. Using a wrench or a socket, loosen the desiccant cartridge bolt. Then separate the desiccant cartridge from the end cover.
  4. Pull the cartridge bolt out of the end of the cover and remove the cartridge.
    Do not attempt to disassemble the desiccant cartridge assembly. Parts for the assembly are not available and the cartridge contains a 150 lb spring that cannot be mechanically caged.
  5. Remove and discard both O-rings from the desiccant cartridge bolt.
  6. Using a clean rag, wipe the inside of the end cover clean. Clean the cartridge bolt bore in the end cover and the sealing surfaces for the large and small diameter desiccant cartridge sealing rings.
  7. Inspect the end cover for physical damage, then inspect all air line fittings for corrosion, and replace as necessary.
  8. Inspect the bolt, paying attention to the threads and O-ring grooves. Clean the bolt.

    9. Important: Use only the grease supplied with Bendix replacement kits.

  9. Lubricate the O-rings, bolt O-ring grooves, the sealing rings, and the cartridge grooves. Lubricate the end cover bore for the bolt.
  10. Install both O-rings on the cartridge bolt and, using a twisting motion, insert the assembled desiccant cartridge bolt in the end cover.
  11. Install the desiccant cartridge on the end cover, making sure that the cartridge is properly seated and flush on the end cover.

    12. Note: It may be necessary to rotate the cartridge slightly until the anti-rotation lugs are properly aligned and allow the cartridge to rest flush against the end cover.

  12. Using a wrench or socket, tighten the desiccant cartridge bolt to 70 lbf·ft (95 N·m). Do not over-torque.
  13. Before placing the vehicle into service, perform the testing listed below.
    1. Close all reservoir drain cocks.
    2. Build the system pressure to governor cutout and note that the AD-IP air dryer purges with an audible escape of air.
    3. Fan the service brakes to reduce system air pressure to governor cut-in. Note that the system once again builds to full pressure and is followed by a purge at the AD-IP air dryer exhaust.
    4. Check for excessive leakage around the head of the desiccant cartridge where it contacts the end cover. With the compressor in loaded mode (compressing air), apply a soapy solution to these areas and observe that any leakage does not exceed a one-inch bubble in one second. If leakage exceeds this measure, remove and re-install the desiccant cartridge.
Note:
Parent topic: Bendix Air Dryer AD–9 or AD–IP Desiccant Replacing
Document Number: 0000121147
Manual Publication Date: 2024-05-24
Topic Publication Date: 2024-11-13