Bendix AD–IP Air Dryers

cen mm 42.02.000

  1. Park the vehicle on a level surface, apply the parking brakes, and chock the tires.
  2. Using a wrench or a socket, loosen the desiccant cartridge bolt. Then separate the desiccant cartridge from the end cover.
  3. Pull the cartridge bolt out of the cover and remove the cartridge.

    4. Warning: 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. Disassembly could release the spring, resulting in personal injury.

  4. Remove and discard both O-rings from the cartridge bolt.
  5. Using a clean rag, wipe clean the inside of the end cover. Clean the cartridge bolt bore in the end cover, and the sealing surfaces for the large- and small-diameter desiccant cartridge sealing rings.
  6. Inspect the end cover for physical damage, then inspect all air line fittings for corrosion; replace as necessary.
  7. Clean and inspect the bolt, paying attention to the threads and O-ring grooves.

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

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

    11. 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.

  11. Using a wrench or socket, tighten the desiccant cartridge bolt 70 lbf·ft (95 N·m). Do not over-tighten.
  12. Before placing the vehicle in service, perform the test below.
    1. Close all reservoir drain cocks.
    2. Build system pressure to governor cut-out, 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 1-inch bubble in 1 second. If leakage exceeds this measure, remove and re-install the desiccant cartridge.
Note:
Parent topic: Replacement of the Air Dryer Desiccant
Document Number: 0000122388
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-06-04