Service manual

21
C. Purge control line must be connected to
unloader port of governor.
D. Test heater and thermostat as described in
Preventative Maintenance Section.
E. See Symptom #1.
F. Repair purge valve and housing.
A. Connect compressor discharge to air dryer
supply port. Reconnect lines properly.
B. Test check valve for proper operation. Repair or
replace as necessary.
C. Check to determine if air passes through
discharge line. Check for kinks, bends,
excessive carbon deposits, or ice blockage.
D. Discharge line should be constantly sloping from
compressor to air dryer with as few bends as
possible.
E. Refer to Symptom #4, Remedies E & F.
A. Inspect control line from governor UNL (unloader)
port to control port of air dryer. Test to determine
air flows through purge control line when
compressor unloaded. Check for undrilled
fittings. (See Symptom #4, Remedy C.)
B. After determining air reaches purge valve
(Remedy A above), repair purge valve.
C. See Causes, B, E, G for Symptom #4.
A. See Causes and Remedies for Symptoms 1, 2,
3, 4 and 5.
B. Vibration should be held to minimum. Add
bracket supports or change air dryer mounting
location if necessary.
C. Replace desiccant cartridge assembly.
D. Check for proper compressor installation; if
symptoms persist, replace compressor.
7. Air dryer does not purge
or exhaust air.
C. Purge control line
connected to reservoir or
exhaust port of governor.
D. Purge valve frozen open -
malfunctioning heater
and thermostat, wiring,
blown fuse.
E. Excessive system
leakage.
F. Purge valve stays open -
supply air leaks to
control side.
A. Inlet and outlet air
connections reversed.
B. Check valve between air
dryer and first reservoir.
C. Kinked or blocked
(plugged) discharge line.
D. Excessive bends in
discharge line (water
collects and freezes).
E. Refer to Symptom 4,
Causes E & F.
A. Missing, broken, kinked,
frozen, plugged or
disconnected purge
control line.
B. Faulty air dryer purge
valve.
C. See Causes B, E, G for
Symptom #4.
AD-9
™
AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS CAUSE
REMEDY
6. Can not build system
air pressure.
8. 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
5. See related causes for
these Symptoms above.
B. Air dryer not securely
mounted. (Excessive
vibration.)
C. Malfunctioning or
saturated desiccant
cartridge.
D. Compressor passing
excessive oil.
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