BENDIX BW2234 ユーザーズマニュアル

5.  Cannot build system air 

pressure.

A.  Supply pressure to the air dryer is not 

suffi cient.

A.  Ensure the supply pressure to the air dryer is greater than  

110 psi after the system charges.

B.  Kinked or blocked (plugged) discharge 

line.

B.  Check to determine if air passes through discharge line. 

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

C.  Excessive bends in discharge line 

(water collects and freezes).

C.  Discharge line should be constantly sloping from compressor 

to air dryer with as few bends as possible.

D.  Pressure protection valve(s) in air 

dryer will not open.

D.  Replace air dryer (pressure protection valves are not 

serviceable).

E.  Refer to Symptom 4.

E.  Refer to Symptom 4, Remedy A.

F.  Refer to Symptom 7.

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

6.  Air dryer does not purge or 

exhaust air.

A.  Faulty air dryer purge valve.

A.  After determining air reaches purge valve control port by 

installing a T-fi tting with a pressure gauge into the governor 
unloader port, repair purge valve if necessary.

B.  See Causes B, E, and F for Symptom 

#4.  

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

Also refer to Symptom 1, Remedy B.

7.  Desiccant material being 

expelled from air dryer purge 
valve exhaust (may look like 
whitish liquid or paste or 
small beads.)  

A.  Faulty dryer cartridge.

A.  Replace the Bendix

®

 AD-IS

®

 air dryer cartridge or AD-IS air 

dryer.

B.  Excessive dryer vibration.

 B.  Check the AD-IS air dryer mounting for looseness or damage.  

Repair mounting and replace cartridge.

8.  Unsatisfactory desiccant life. A.  Excessive system leakage.

A.  Refer to Symptom 1, Remedy A.

B.  Wrong vehicle application for AD-IS

®

 

air dryer.

B.  Refer to Symptom 2, Remedy C.

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 

during compressor loaded 
cycle.  

A.  Single cylinder compressor with high 

pulse cycles. 

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

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

 

air 

dryer and reservoir system. 

10.  The air dryer purge piston 

c y c l e s   r a p i d l y   i n   t h e 
compressor unloaded (non-
compressing) mode.  

A.  Compressor fails to “unload”.

A.  Check air hose from governor to compressor for a missing, 

kinked or restricted line.  Install or repair air hose. 

 

Repair or replace compressor unloader.