Service manual

22
AD-9
™
AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS CAUSE
REMEDY
E. Check the torque on the desiccant cartridge to
end cover attachment. Refer to assembly
section of this service data sheet.
A. Refer to Remedy C, Symptom #1.
B. Repair or replace purge valve assembly.
C. Repair or replace purge valve assembly.
A. Refer to Remedy C, Symptom #1.
B. Repair or replace purge valve assembly.
C. Repair or replace purge valve assembly.
A. Faulty governor installation; no air line from
governor to compressor or line is kinked or
restricted. Install or repair air line.
9. “Pinging” noise
excessive during
compressor loaded
cycle.
E. Desiccant cartridge not
assembled properly to
end cover. (Loose
attachment)
A. Defective check valve
assembly in AD-9
™
air
dryer end cover.
B. Leaking Turbo Cutoff
valve.
C. Leaking purge valve
control piston o-ring.
10. Constant seepage of air
at air dryer purge valve
exhaust (non-charging
mode.)
A. Defective check valve
assembly in AD-9
™
air
dryer end cover.
B. Leaking Turbo Cutoff
valve.
C. Leaking purge valve
control piston o-ring.
A. Compressor fails to
“unload”.
11. The air dryer purge
piston cycles rapidly in
the compressor
unloaded (non-
compressing) mode.
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