Bendix Commercial Vehicle Systems AD-SP SYSTEM PURGE AIR DRYER 10/04 - Manual (Page 3)

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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
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.