DESCRIPTION
The function of the Bendix® AD-IP®integral purge air dryer — and the Bendix® AD-IP®integral purge air dryer with PuraGuard® oil coalescing — is to collect and remove air system contaminants in solid, liquid and aerosol form, before they enter the brake system. They provide clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs. Daily manual draining of the reservoirs is eliminated.
The AD-IP and AD-IP PuraGuard oil coalescing air dryers consist of a desiccant cartridge secured to a die cast aluminum end cover with a single, central bolt. The end cover contains a check valve assembly, safety valve, heater and thermostat assembly, three pipe thread air connections, optional extended purge port (plugged), and the purge valve assembly. The removable purge valve assembly incorporates the purge valve mechanism and a turbo charger cut-off feature that is designed to prevent loss of engine turbo-boost pressure during the purge cycle of the air dryer. For ease of serviceability, all replaceable assemblies can be replaced without removing the air dryer from its mounting on the vehicle.
The AD-IP PuraGuard oil coalescing air dryer has an identical appearance to the standard AD-IP air dryer, but contains a coalescing media at the inlet of the desiccant bed. The coalescing media provides a higher level of oil removal over the standard AD-IP air dryer. The AD- IP PuraGuard oil coalescing air dryer has all the same functions of the standard AD-IP air dryer and is used where lower oil concentration levels are required. The AD-IP
PuraGuard oil coalescing air dryer can be identified by the
PuraGuard oil coalescing label shown in Figure 1 located on the air dryer cartridge.
Early Bendix AD-IP air dryers included a “Drop In”
configuration for air systems that use either the Holset®
(Cummins®) Type E or QE air compressor. For information
pertaining to this configuration see the Bendix AD-IP Air
Dryer Troubleshooting Chart at the end of the manual.
IMPORTANT
When servicing, note that standard Bendix AD-IP air dryers, or air dryer cartridges, may be serviced with PuraGuard® oil coalescing air dryer or cartridges, however, PuraGuard (PG) oil coalescing air dryer or cartridges must only be serviced with like replacements.
Sensitive downstream components such as automated manual transmissions, diesel exhaust emission systems, etc. can be damaged due to excessive oil levels. Therefore, always replace a PG cartridge with a Bendix PG cartridge.
The AD-IP air dryer has three female pipe thread air connections identified as follows:
Air Connection | Function/Connection |
CON 4 | Control Port (purge valve control |
| & turbo cut-off). |
SUP 11 | Supply Port (air in). |
DEL 2 | Delivery Port (air out). |
(Not Identified) | Extended Purge Port |
