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BENDIX

SYMPTOM

2. Water in vehicle reservoirs

3. Safety valve on air dryer

"popping off" or exhausting

air.

4. Constant exhaust of air at air

dryer purge valve exhaust

or unable to build system

pressure. (Charge mode.)

AD-IS

AIR DRYER AND 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 air dryer).

C. Excessive air usage - Air dryer not

compatible with 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 insufﬁ cient

due to excessive system leakage.

A. Defective AD-IS air dryer and reservoir

system delivery check valve.

B. Safety valve setting too low (<150 p.s.i.) B. Replace safety valve.

C. System pressure too high (>135 p.s.i.) C. Test with accurate gauge. Replace governor if necessary.

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, blown fuse.

C. Defective AD-IS air dryer delivery

check valve.

D. Leaking Turbo Cut-Off valve.

E. Defective governor.

F. Leaking purge valve control piston

seals.

REMEDY

A. Check for excessive carbon build up in compressor discharge

line. Replace if required. Make certain that discharge line

length is at least 6 ft. Increase discharge line length and/or

diameter to reduce air dryer inlet temperature.

B. If system must have outside air ﬁ ll provision, outside air should

pass through air dryer.

C. Refer to Bendix Advanced Troubleshooting Guide for Air

Brake Compressors (BW1971) for proper application of the

Bendix

AD-IS

air dryer and reservoir system. An extended

purge model (Bendix

AD-IS

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 inﬂ ation, the

air for these accessories must by-pass the dryer reservoir

system.

D. Replace desiccant cartridge assembly.

E. If vehicle uses Holset compressor, inspect feedback 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 check valve. Repair

or replace. Refer to Symptom 1, Remedy B.

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

A. With compressor loaded, apply soap solution on purge valve

exhaust, to test for excessive leakage. Repair or replace

purge valve as necessary.

Refer to Technical Bulletin TCH-008-040.

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

heater and thermostat test.

C. Refer to Symptom 1, Remedy B.

D. Repair or replace purge valve assembly.

E. Check governor at both "cut-in" and "cut-out" position for (i)

proper pressures and (ii) excessive leakage at ﬁ ttings and

exhaust.

F. Repair or replace purge valve assembly.

EP) is available for many higher

air dryer and reservoir system.