Bendix Commercial Vehicle Systems AD-SP SYSTEM PURGE AIR DRYER 10/04 - Manual (Page 23)

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AD-SP ™ AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS CAUSE REMEDY
9. Desiccant material
being expelled from air
dryer purge valve
exhaust (may look like
whitish liquid or paste
or small beads).
-OR-
Unsatisfactory
desiccant life.
A. This symptom is almost
always accompanied by
one or more of
Symptoms 1, 2, 3, 4,
and 6. See related
causes for these
Symptoms above.
A. See related Remedies for Causes under
Symptoms 1, 2, 3, 4 and 6*.
B. Vibration should be held to minimum. Add
bracket supports or change air dryer mounting
location if necessary*.
C. Replace*.
D. Check for proper compressor installation; if
symptoms persist, replace compressor*.
E. Refer to Symptom #7 Causes and Remedies*.
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 an additional four
feet of discharge line or adding a 90 cubic inch
reservoir between the compressor and the
AD-SP
™ air dryer.
A. Faulty governor installation: no air line from
governor to compressor or line is “kinked” or
restricted. Install or repair air line.
10. “Pinging” noise
excessive during
compressor loaded
cycle.
A. A single cylinder
compressor with high
pulse cycles.
B. Air dryer not securely
mounted. (Excessive
vibration.)
C. Defective desiccant
cartridge.
E. Air dryer has not purged
for an extended period.
D. Compressor passing
excessive oil.
11. The air dryer purge
piston cycles rapidly in
the compressor
unloaded (non-
compressing) mode.
A. Compressor fails to
“unload.”
*If desiccant material is being expelled, cartridge and purge valve must be removed from air dryer and desiccant
material must be removed from interior of dryer. Clean the interior surfaces of dryer and install a new cartridge. Clean
and inspect the purge valve before re-installation, or replace with a new purge valve.