BENDIX AD-1 AIR DRYER Troubleshooting Guide

1®DESCRIPTIONThe function of the Integrated Solution Air Dryer (AD-IS®)and Reservoir System is to provide heavy vehicles with anintegrated vehicle ai

10CLEANING & INSPECTION1. Use a suitable solvent to clean all metal parts, and usea cotton swab to clean the bore (Note: Do not useabrasives or to

11AD-IS® AIR DRYER AND RESERVOIR SYSTEM TROUBLESHOOTING CHARTSYMPTOM1. Dryer is constantly“cycling” or purging.A. Test for excessive system leakage.Al

12TROUBLESHOOTING CHART (Continued)SYMPTOMCAUSEREMEDYD. Replace desiccant cartridge assembly.D. Desiccant requiresreplacement.E. Air by-passes desicca

13TROUBLESHOOTING CHART (Continued)SYMPTOMCAUSEREMEDYC. Refer to Symptom 1, Remedy B.D. Repair or replace purge valve assembly.E. Check governor at bo

14TROUBLESHOOTING CHART (Continued)SYMPTOM CAUSEREMEDYB. Excessive bends indischarge line (watercollects and freezes).C. Pressure protectionvalve(s) i

15A. Compressor fails to“unload”.10. The air dryer purgepiston cycles rapidly inthe compressorunloaded (non-compressing) mode.A. Check air hose from g

16BW2234 © 2007 Bendix Commercial Vehicle Systems LLC All rights reserved. 5/2007 Printed in U.S.A.

2FIGURE 2 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM CHARGE CYCLECOMPRESSORGOVERNORPURGECONTROLCHANNELDESICCANTBEDDELIVERYCHECKVALVE(OPEN)PURGERESERVOIRP

3FIGURE 3 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM PURGE CYCLECOMPRESSORGOVERNORPURGECONTROLCHANNELDESICCANTBEDDELIVERYCHECKVALVE(CLOSED)PURGERESERVOIR

4of the contaminants to condense and drop to the bottom ofthe air dryer and reservoir system purge valve assembly,ready to be expelled at the next pur

5may require replacement; however, the followingconditions can also cause water accumulation andshould be considered before replacing the desiccant:A.

6A. Electric Power to the DryerWith the ignition or engine kill switch in the RUNposition, check for voltage to the heater andthermostat assembly usin

7be designed specifically for such applications andsystems.9. Components with stripped threads or damagedparts should be replaced rather than repaired

8If, after completing the routine operation and leakage tests,it has been determined that one or more components of theair dryer and reservoir system

9FIGURE 7 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM DELIVERY CHECK VALVEGOVERNOR GASKET(SPECIAL GASKET,SEE NOTE 6)GOVERNOR(NON-ADJUSTABLE,130 PSI CUT-OU