DRM/AD-IS®AIR DRYER TROUBLESHOOTING CHART (Continued)

 

SYMPTOMS

CAUSE

REMEDY

5. Can not build system

A. Kinked or blocked

A. Check to determine if air passes through

(plugged) discharge line.

discharge line. Check for kinks, bends,

 

air pressure.

 

 

 

excessive carbon deposits, or ice blockage.

 

 

 

 

 

 

B. Excessive bends in

B. Discharge line should be constantly sloping from

 

 

discharge line (water

compressor to air dryer with as few bends as

 

 

collects and freezes).

possible.

 

 

 

 

 

 

C. Pressure protection

C. Replace air dryer (pressure protection valves are

 

 

valve(s) in air dryer will

not serviceable).

 

 

not open.

 

 

 

 

 

 

 

D. Refer to Symptom 4.

D. Refer to Symptom 4, Remedy A.

 

 

 

 

 

 

E. Refer to Symptom 7.

E. Refer to Symptom 7, Remedies A through D.

 

 

 

6. Air dryer does not purge

A. Faulty air dryer purge

A. After determining air reaches purge valve control

 

or exhaust air.

valve.

port by installing a T-fitting with a pressure

 

 

 

gauge into the governor unloader port, repair

 

 

 

purge valve if necessary.

 

 

 

 

 

 

B. See Causes, B, E, and

B. Refer to Symptom 4, Remedies B, E, and G.

 

 

G for Symptom #4.

Also refer to Symptom 1, Remedy B.

 

 

 

 

7.

Desiccant material

A. Faulty dryer cartridge.

A. Replace AD-IS®air dryer cartridge and/or

 

being expelled from air

 

AD-IS®air dryer.

 

 

 

 

dryer purge valve

 

 

 

B. Excessive dryer vibration.

B. Check reservoir mounting for looseness or

 

exhaust (may look like

 

whitish liquid or paste

 

damage. Repair mounting and replace cartridge.

 

 

 

 

or small beads.)

 

 

 

 

 

 

8.

Unsatisfactory

A. Excessive system

A. Refer to Symptom 1, Remedy A.

 

desiccant life.

leakage.

 

 

 

 

 

 

 

B. Wrong vehicle application

B. Refer to Symptom 2, Remedy C.

 

 

for AD-IS®air dryer.

 

 

 

 

 

 

 

C. Compressor passing

C. Check for proper compressor installation; if

 

 

excessive oil.

symptoms persist, replace compressor. Refer to

 

 

 

Bendix Advanced Troubleshooting Guide for Air

 

 

 

Brake Compressors (BW1971).

 

 

 

 

9.

“Pinging” noise

A. Single cylinder

A. A slight “pinging” sound may be heard during

 

excessive during

compressor with high

system build up when a single cylinder

 

compressor loaded

pulse cycles.

compressor is used. If this sound is deemed

 

cycle.

 

objectionable, it can be reduced substantially by

 

 

 

 

 

 

increasing the discharge line volume.

 

 

 

This can be accomplished by adding a 90 cubic

 

 

 

inch reservoir between the compressor and the

 

 

 

AD-IS®air dryer.

 

 

 

 

13

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Image 13
BENDIX BW1948 manual DRM/AD-ISAIR Dryer Troubleshooting Chart