BENDIX AD-9si Service Data - Page 15
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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, paste, or small
beads.)
8. Unsatisfactory desiccant life. A. Excessive system leakage.
9. "Pinging" noise excessive
during compressor loaded
cycle.
10. The air dryer purge piston
c y c l e s r a p i d l y i n t h e
compressor unloaded (non-
compressing) mode.
BENDIX
AD-9si
®
TROUBLESHOOTING CHART
CAUSE
A. Supply pressure to the air dryer is not
sufficient.
B. Kinked or blocked (plugged) discharge
line.
C. Excessive bends in discharge line (water
collects and freezes).
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.
B. Wrong vehicle application for AD-9si
air dryer.
C. Compressor passing excessive oil.
A. Single cylinder compressor with high
pulse cycles.
A. Compressor fails to "unload".
AIR DRYER
®
A. Ensure the supply pressure to the air dryer is greater than
110 psi during the system charge.
B. Check to determine if air passes through the discharge line.
Check for kinks, bends, excessive carbon deposits, or ice
blockage.
C. The discharge line should be constantly sloping from the
compressor to the air dryer with as few bends as possible.
D. Refer to Symptom 4, Remedy A.
E. Refer to Symptom 7, Remedies A and B.
A. After determining that air reaches the purge valve piston – by
installing a Tee fitting with a pressure gauge into the control
port – repair the purge valve if necessary.
B. Refer to Symptom 4, Remedies B, E, and F.
A. Replace the Bendix
®
dryer.
B. Check the AD-9si air dryer mounting for looseness or damage.
Repair the mounting and replace the 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 the compressor. Refer to Bendix
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-9si air dryer.
A. Check the air hose from the AD-9si air dryer control port to the
compressor for a missing, kinked, or restricted line. Install or
repair the air hose. Repair or replace the compressor unloader.
Check the compressor for a missing, kinked, or restricted line.
Install or repair the air hose.
REMEDY
AD-9si
air dryer cartridge or AD-9si air
®
®
Advanced
15