User's Manual

14
TROUBLESHOOTING CHART (Continued)
SYMPTOM CAUSE
REMEDY
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.
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.
5. Cannot build system air
pressure.
A. Kinked or blocked
(plugged) discharge line.
A. Check to determine if air passes through discharge
line. Check for kinks, bends, excessive carbon
deposits, or ice blockage.
6. Air dryer does not purge
or exhaust air.
A. Faulty air dryer purge
valve.
B. See Causes B, E, and F
for Symptom #4.
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.
7. Desiccant material
being expelled from air
dryer purge valve
exhaust (may look like
whitish liquid or paste
or small beads.)
A. Faulty dryer cartridge.
B. Excessive dryer vibration.
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.
8. Unsatisfactory
desiccant life.
A. Excessive system
leakage.
B. Wrong vehicle application
for AD-IS
®
air dryer.
C. Compressor passing
excessive oil.
A. Refer to Symptom 1, Remedy A.
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.
9. “Pinging” noise
excessive during
compressor loaded
cycle.
A. Single cylinder
compressor with high
pulse cycles.
B. Refer to Symptom 2, Remedy C.