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1. Troubleshooting Chart

BENDIX

SYMPTOM

2. Water in the vehicle

reservoirs.

3. Safety valve on the air

dryer is "popping off" or

exhausting air.

4. Constant exhaust of air at

the air dryer purge valve

exhaust or unable to build

system pressure. (Charge

mode.)

AD-IS

AIR DRYER & RESERVOIR SYSTEM

TROUBLESHOOTING CHART

CAUSE

A. Maximum air dryer inlet temperature is

exceeded due to improper discharge

line length.

B. Air system charged from outside

air source (outside air not passing

through the air dryer).

C. Excessive air usage – Air dryer not

compatible with the vehicle air system

requirement (Improper air dryer/

vehicle application).

D. Desiccant requires replacement.

E. Air by-passes desiccant cartridge

assembly.

F. Air dryer not purging.

G. Purge (air exhaust) time is insufficient

due to excessive system leakage.

A. Defective AD-IS air dryer & reservoir

system delivery check valve.

B. Safety valve setting too low (<150 psi) B. Replace the safety valve.

C. System pressure too high (>135 psi)

D. Excessive pressure pulsations from

compressor. (Typical single cylinder

type).

A. Air dryer purge valve leaking

excessively.

B. Purge valve frozen open – faulty heater

and thermostat, wiring, or blown fuse.

C. Defective Bendix

AD-IS

delivery check valve.

D. Leaking turbo cut-off valve.

E. Defective governor.

F. Leaking purge valve control piston

seals.

A. Check for excessive carbon build-up in the compressor

discharge line. Replace if required. Make certain that the

discharge line length is at least 6 ft. Increase the discharge line

length and/or diameter to reduce air dryer inlet temperature.

B. If the system must have an outside air fill provision, the outside

air should pass through the air dryer.

C. Refer to the Bendix Advanced Troubleshooting Guide for Air

Brake Compressors (BW1971) for proper application of the

Bendix

AD-IS

purge model (Bendix

air usage vehicles, such as city buses and construction

vehicles.

If the vehicle is equipped with high air usage accessories,

such as trailer pump-off systems or central tire inflation, the

air for these accessories must by-pass the dryer reservoir

system.

D. Replace the desiccant cartridge assembly.

E. If the vehicle uses a Holset

check valve for proper installation and operation.

F. Refer to Symptom 6.

G. Refer to Symptom 1.

A. Test to determine if air is passing through the check valve.

Repair or replace. Refer to Symptom 1, Remedy B.

C. Test with an accurate gauge. Replace the governor if

necessary.

D. Increase volume in discharge line. This can be accomplished

by adding a 90 cubic inch (or larger) reservoir between the

compressor and the AD-IS air dryer & reservoir system.

A. With the compressor loaded, apply a soap solution on the

purge valve exhaust, to test for excessive leakage. Repair or

replace the purge valve as necessary.

B. Refer to paragraph 5 of the Operation and Leakage Tests

for the heater and thermostat test.

air dryer

C. Refer to Symptom 1, Remedy B.

D. Repair or replace the purge valve assembly.

E. Check the governor at both "cut-in" and "cut-out" positions

for (i) proper pressures and (ii) excessive leakage at fittings

and exhaust.

F. Repair or replace the purge valve assembly.

REMEDY

air dryer & reservoir system. An extended

AD-IS

EP) is available for many higher

compressor, inspect the feedback