Bendix Commercial Vehicle Systems AD-RP PuraGuard Oil Coalescing Remote Purge Air Dryers - Manual (Page 24)

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