BENDIX AD-2 Manual - Page 16

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BENDIX AD-2 Manual
SYMPTOM
4. Constant exhaust of air
at air dryer purge valve
exhaust or unable to
build system pressure.
5. Air dryer does not purge
or exhaust air.
6. Desiccant material being
expelled from air dryer
purge valve exhaust
(may look like whitish
liquid or paste or small
beads).
OR
Unsatisfactory desiccant
life.
7. Unable to remove end
cover, or unable to install
new desiccant cartridge.
8. Air dryer end cover
separates from air dryer
housing during operation.
16
CAUSE
A.
Air dryer purge valve leaking
excessively.
B.
Defective governor.
C.
Purge control line connected to
reservoir or exhaust port of governor.
D.
Purge valve frozen open - faulty
heater and thermostat, wiring, blown
fuse.
E.
Inlet and outlet air connections
reversed.
F.
Check valve between air dryer and first
reservoir defective.
G.
Kinked or blocked (plugged)
discharge line.
H.
Excessive bends in discharge line
(water collects and freezes).
I.
Excessive system leakage.
A.
Broken, kinked, frozen, plugged or
disconnected purge control line.
B.
Faulty air dryer purge valve.
C.
See Causes B,E,F,G,H, for Symptom
#4.
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.
Defective cloth covered perforated
plate in air dryer desiccant cartridge
or improperly rebuilt desiccant
cartridge.
D.
Compressor passing excessive oil.
E.
Faulty heater and thermostat, wiring,
fuse not allowing purge. (Cold weather
operation only.)
A.
Result of reversing the inlet and outlet
connections. (See Symptom #4,
Cause E.)
A.
Excessive system pressure build up
within air dryer; caused by either
plugged desiccant, check valve failure,
frozen or obstructed discharge line
(between air dryer and first reservoir) or
governor failure in conjunction with
safety valve failure.
BW1597 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 7/2004 Printed in U.S.A.
REMEDY
A.
With compressor loaded, apply soap solution
on purge valve exhaust, to test for excessive
leakage. Repair purge valve as necessary.
B.
Check governor for proper "cut-in", "cut-out"
pressure and excessive leakage in both
positions. Repair or replace as necessary.
C.
Purge control line must be connected to
unloader port of governor.
D.
Test heater and thermostat as described in
Step 7 of Preventive Maintenance Section.
E.
Compressor discharge to inlet port. Reconnect
lines properly.
F.
Test check valve for proper operation (see
Symptom #3, Remedy B).
G.
Check to determine if air passes through
discharge line. Check for kinks, bends,
excessive carbon deposits.
H.
Discharge line should be constantly sloping
from compressor to air dryer with as few bends
as possible.
I.
See Symptom #1's Causes and Remedies.
A.
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.
Refer to Remedies B, E, F, G, H, 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 or rebuild desiccant cartridge. NOTE:
If rebuilding cartridge, carefully follow
instructions packed with cartridge
D.
Check for proper compressor installation; if
symptoms persist, replace compressor.
E.
Refer to Remedy D under Symptom #4.
A.
Refer to Symptom #4, Cause E.
A.
Because it is difficult to determine extent of
internal damage to air dryer, it is recommended
that the air dryer be replaced.
NOTE: This type of failure can be prevented by
checking the dryer for proper operation every
three (3) months.
rebuild kit.