The troubleshooting procedure presented on the below pages has been excerpted from a troubleshooting card entitled: Troubleshooting Charging and Air Supply Systems. The complete card can be obtained from authorized Bendix parts outlets under literature number BW1779. It is presented here because of the air dryers’ connection to the supply air system and for convenience. The procedure is not all-inclusive but rather represents the most commonly encountered complaints.
Air Dryer Assembly
TESTING THE AD-9™ AIR DRYER
Before placing the vehicle in service, perform the following tests:
1. Close all reservoir drain cocks.
2. Build up system pressure to governor cut-out and note that the AD-9™ 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-9™ air dryer exhaust.
4. It is recommended that the following items be tested for leakage to assure that the AD-9™ air dryer will not cycle excessively.
(A) Total air system leakage (See Bendix publication BW-5057 “Air Brake Handbook”).
(B) Compressor unloader mechanism.
(C) Governor.
(D) Drain cock and safety valve in the first (supply) reservoir.
(E) All air connections leading to and from the first (supply) reservoir.
Haldex Pure Air Plus Air Dryer Troubleshooting Guide
L20043 Rev. 12/99
SERVICE KITS
- DQ6020 Major Repair Kit (Includes Purge, Turbo Saver and One-Way Check Valve Assemblies.)
- DQ6032 Coalescing Filter Kit
- DQ6026 Desiccant Kit (Includes Desiccant Cartridge, Coalescing Filter, Heater Cover, and Relief Valve.)
- DQ6011 12-Volt Heater Kit (For dryers date coded prior to 9-97)
- DQ6012 24-Volt Heater Kit (For dryers date coded prior to 9-97)
- DQ6013 12-Volt Heater Kit (For dryers date coded after 8-97)
- DQ6014 24-Volt Heater Kit (For dryers date coded after 8-97)
- DQ6023 Shield Kit
- DQ6024 Clamp Band Kit
- KN31527 Relief Valve