BENDIX® AD-IP®AIR DRYER TROUBLESHOOTING CHART

SYMPTOMS

CAUSE

REMEDY

5. Constant exhaust

A. Air dryer purge valve is

A. With the compressor loaded, apply a soap solution

of air at air dryer

leaking excessively.

on the purge valve exhaust, to test for excessive

purge valve exhaust.

 

leakage. Refer to Technical Bulletin TCH-008-040.

(Charge mode.)

 

Repair the purge valve as necessary.

 

B. Compressor fails to unload

B. Confirm the failure to unload by increasing &

 

(stop compressing air) and

decreasing engine RPM and noting change in the

 

the air dryer purge exhaust

rate of leakage and intensity of accompanying

 

makes “sputtering” or

leakage sound. Repair/replace compressor

 

“popping” sound.

unloaders.

 

C. Purge control line connected

C. Purge control line must be connected to unloader

 

to reservoir or exhaust port

port of governor.

 

of governor.

 

 

D. Purge valve frozen open -

D. Test the heater and thermostat as described in

 

malfunctioning heater and

Preventative Maintenance Section.

 

thermostat, wiring, blown

 

 

fuse.

 

 

E. Excessive system leakage.

E. See Symptom #1.

 

 

 

 

F. Purge valve stays open -

F. Repair the purge valve and housing.

 

supply air leaks to control

 

 

side.

 

6. Can not build system

A. Inlet and outlet air

A. Connect compressor discharge to the air dryer

air pressure.

connections reversed.

supply port. Reconnect the lines properly.

 

B. Check valve between the air

B. Test the check valve for proper operation. Repair

 

dryer and first reservoir.

or replace as necessary.

 

C. Kinked or blocked (plugged)

C. Check to determine if air passes through the

 

discharge line.

discharge line. Check for kinks, bends, excessive

 

 

carbon deposits, or ice blockage.

 

D. Excessive bends in

D. Discharge line should be constantly sloping from

 

discharge line (water collects

the compressor to the air dryer with as few bends

 

and freezes)

as possible.

 

E. Refer to Symptom 4, Causes

E. Refer to Symptom #4, Remedies E & F.

 

E & F.

 

 

 

 

7. Air dryer does not

A. Missing, broken, kinked,

A. Inspect control line from the governor UNL

purge or exhaust air.

frozen, plugged or

(unloader) port to control port of air dryer. Test to

 

disconnected purge control

determine if air flows through purge control line

 

line.

when compressor unloaded. Check for undrilled

 

 

fittings. (See Symptom #4, Remedy C.)

 

B. Faulty air dryer purge valve.

B. After determining the air reaches the purge valve

 

 

(Remedy A above), repair the purge valve.

 

C. See Causes, B, E, G for

C. Refer to Remedies B, E, G for Symptom #4.

 

Symptom #4.

 

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BENDIX SD-08-2414 manual Leakage. Refer to Technical Bulletin TCH-008-040, Preventative Maintenance Section