BENDIX SD-08-2433 manual Troubleshooting Guide for Air Brake Compressor BW1971

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BENDIX®AD-9siAIR DRYER

TROUBLESHOOTING CHART

 

SYMPTOM

 

CAUSE

 

REMEDY

5.

Cannot build system air

A.

Supply pressure to the air dryer is not

A.

Ensure the supply pressure to the air dryer is greater than

 

pressure.

 

sufficient.

 

110 psi during the system charge.

 

 

B.

Kinked or blocked (plugged) discharge

B.

Check to determine if air passes through discharge line.

 

 

 

line.

 

Check for kinks, bends, excessive carbon deposits, or ice

 

 

 

 

 

blockage.

 

 

C.

Excessive bends in discharge line

C. Discharge line should be constantly sloping from compressor

 

 

 

(water collects and freezes).

 

to air dryer with as few bends as possible.

 

 

D. Refer to Symptom 4.

D. Refer to Symptom 4, Remedy A.

 

 

E. Refer to Symptom 7.

E. Refer to Symptom 7, Remedies A and B.

6. Air dryer does not purge or

A.

Faulty air dryer purge valve.

A.

After determining that air reaches the purge valve piston by

 

exhaust air.

 

 

 

installing a Tee fitting with a pressure gauge into the control

 

 

 

 

 

port, repair purge valve if necessary.

 

 

B.

See Causes B, E, and F for Symptom

B.

Refer to Symptom 4, Remedies B, E, and F.

 

 

 

#4.

 

 

7.

Desiccant material being

A.

Faulty dryer cartridge.

A.

Replace the Bendix® AD-9siair dryer cartridge or AD-9si air

 

expelled from air dryer purge

 

 

 

dryer.

 

valve exhaust (may look like

 

 

 

 

 

B.

Excessive dryer vibration.

B.

Check the AD-9si air dryer mounting for looseness or

 

whitish liquid or paste or

 

 

 

damage. Repair mounting and replace cartridge.

 

small beads.)

 

 

 

 

8.

Unsatisfactory desiccant life.

A.

Excessive system leakage.

A. Refer to Symptom 1, Remedy A.

 

 

B. Wrong vehicle application for AD-9si

B.

Refer to Symptom 2, Remedy C.

 

 

 

air dryer.

 

 

 

 

C.

Compressor passing excessive oil.

C.

Check for proper compressor installation; if symptoms

 

 

 

 

 

persist, replace compressor. Refer to Bendix® Advanced

 

 

 

 

 

Troubleshooting Guide for Air Brake Compressor (BW1971).

9.

“Pinging” noise excessive

A.

Single cylinder compressor with high

A.

A slight “pinging” sound may be heard during system build-

 

during compressor loaded

 

pulse cycles.

 

up when a single cylinder compressor is used. If this sound

 

cycle.

 

 

 

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.

10. The air dryer purge piston

A.

Compressor fails to “unload”.

A. Check the air hose from the AD-9si air dryer control port to the

 

c y c l e s r a p i d l y i n t h e

 

 

 

compressor for a missing, kinked, or restricted line. Install or

 

compressor unloaded (non-

 

 

 

repair the air hose. Repair or replace the compressor unloader.

 

compressing) mode.

 

 

 

 

 

 

 

 

 

 

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Contents SD-08-2433 General Safety Guidelines Description Charge Cycle Refer to Figures 2 Purge Cycle Refer to Figures 3 Bendix AD-9siAIR Dryer Without GOVERNOR-CHARGE Cycle Turbo CUT-OFF Feature Refer to Figures Preventive Maintenance General Temporary AIR Dryer Bypass Bendix AD-9siAIR Dryer Serviceable Components Delivery Check Valve Cleaning Procedure Troubleshooting Chart Refer to the Bendix Air Dryer Application Guideline BW2600 Troubleshooting Guide for Air Brake Compressor BW1971 Log-on and Learn from the Best