BENDIX AD-IS - Manual - Página 14

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SYMPTOM

5. Cannot build system air

pressure.

6. Air dryer does not purge

or exhaust air.

7. Desiccant material

being expelled from air

dryer purge valve

exhaust (may look like

whitish liquid or paste

or small beads.)

8. Unsatisfactory

desiccant life.

9. "Pinging" noise

excessive during

compressor loaded

cycle.

TROUBLESHOOTING CHART (Continued)

CAUSE

A. Kinked or blocked

(plugged) discharge line.

B. Excessive bends in

discharge line (water

collects and freezes).

C. Pressure protection

valve(s) in air dryer will

not open.

D. Refer to Symptom 4.

E. Refer to Symptom 7.

A. Faulty air dryer purge

valve.

B. See Causes B, E, and F

for Symptom #4.

A. Faulty dryer cartridge.

B. Excessive dryer vibration.

A. Excessive system

leakage.

B. Wrong vehicle application

for AD-IS

air dryer.

C. Compressor passing

excessive oil.

A. Single cylinder

compressor with high

pulse cycles.

REMEDY

A. Check to determine if air passes through discharge

line. Check for kinks, bends, excessive carbon

deposits, or ice blockage.

B. Discharge line should be constantly sloping

from compressor to air dryer with as few bends as

possible.

C. Replace air dryer (pressure protection valves are

not serviceable).

D. Refer to Symptom 4, Remedy A.

E. Refer to Symptom 7, Remedies A and B.

A. After determining air reaches purge valve control

port by installing a T-fitting with a pressure gauge

into the governor unloader port, repair purge valve

if necessary.

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

Also refer to Symptom 1, Remedy B.

A. Replace AD-IS

air dryer cartridge and/or AD-IS

air dryer.

B. Check the AD-IS

air dryer mounting for looseness

or damage. Repair mounting and replace cartridge.

A. Refer to Symptom 1, Remedy A.

B. Refer to Symptom 2, Remedy C.

C. Check for proper compressor installation; if

symptoms persist, replace compressor. Refer to

Bendix Advanced Troubleshooting Guide for Air

Brake Compressor (BW1971).

A. A slight "pinging" sound may be heard during

system build up when a single cylinder compressor

is used. If this sound is deemed objectionable, it

can be reduced substantially by increasing the

discharge line volume.

This can be accomplished by adding a 90 cubic

inch (or larger) reservoir between the compressor

and the AD-IS

air dryer and reservoir system.