BENDIX AD-1 AIR DRYER Service Manual

1CONTROLPORTSUPPLYPORTSD-08-2412Bendix® AD-9™ Air DryerEXTENDED PURGE AD-9™ AIR DRYER STANDARD AD-9™ AIR DRYEROUTERSHELLWI RING HARNESSCONNECT IONDEL

103. Install the desiccant cartridge o-ring (21) in its groove inthe end cover. Using a light coat of lubricant (included inkit), lubricate the bottom

11LOCATING AD-9™ AIR DRYER ON VEHICLE1. The AD-9™ air dryer must be mounted vertically (purgeexhaust toward road surface) outside the enginecomp

12position the unit for ease of installation. Locate thebracket such that it cradles the end cover as shown inFigure 9. Utilizing the two 2-3/

13WIRING THE HEATER/THERMOSTAT1. Determine the vehicle’s electrical system voltage andmake certain that the AD-9™ air dryer that is to bein

14AD-9™ AIR DRYER TROUBLESHOOTING CHARTSYMPTOMS1. Dryer is constantly“cycling” or purging.Dryer purges frequently(every 4 minutes or lesswhile vehicle

15AD-9™ AIR DRYER TROUBLESHOOTING CHARTSYMPTOMS CAUSEREMEDY1. Test fittings, hoses, lines and connections.Apply soap solution to detect excessiveleaka

16solution to air dryer purge exhaust and purgecontrol port (where the control line wasremoved). Leakage should not exceed a 1"bubble in 5 second

17 2. Water in vehiclereservoir.A. Desiccant requiresreplacement - excessivecontaminants indesiccant cartridgeassembly.B. Improper discharge linelengt

18G. Air compressordischarge and/or airdryer inlet temperaturetoo high.AD-9™ AIR DRYER TROUBLESHOOTING CHARTSYMPTOMS CAUSEREMEDYPurge Cycle Time - Dur

19AD-9™ AIR DRYER TROUBLESHOOTING CHARTSYMPTOMS CAUSEREMEDYRestricted air inlet (not enough air tocompressor). Check compressor air inlet line forres

2ORIFICEPURGEVOLUMEDELIVERYPORTHEATERELEMENTSUM PEX HA USTPU RGEVALVERESERVOIRSUPPLYPORTCOMPRESSORGOVERNORENGINETUR BOCONTR OLPORTOILSEPARATORDESICCAN

20E. Excessive pressurepulsations fromcompressor. (Typicalsingle cylinder type).F. Governor malfunction.Missing or restrictedgovernor control lineinst

21C. Purge control line must be connected tounloader port of governor.D. Test heater and thermostat as described inPreventative Maintenance Section.E.

22AD-9™ AIR DRYER TROUBLESHOOTING CHART (Continued)SYMPTOMS CAUSEREMEDYE. Check the torque on the desiccant cartridge toend cover attachment. Refer to

23Bendix® BA-922®, or DuraFlo™ 596 air compressorCompressor with up to 25% duty cycleFootnotes:1 With increased air demand the air dryer cartri

24HOLSET TYPE"E & QE"COMPRESSORW/O ECONVALVEDASHGAUG ELOW PRESSUREINDICATORAdditional Troubleshooting InformationThe troubleshooting p

3vapor adhering to it. Generally 15-30 seconds are requiredfor the entire purge volume of a standard AD-9™ air dryer toflow through the desiccant dryi

4FIGURE 4 - AD-9™ AIR DRYER TURBO CUTOFFAt the onset of the purge cycle, the downward travel of thepurge piston is stopped when the turbo cut-off valv

5and should not be considered as an indication thatthe dryer is not performing properly.Note: A small amount of oil in the system may be normaland sh

6B. Thermostat and Heater OperationTurn off the ignition switch and cool the end coverassembly to below 40 degrees Fahrenheit. Using anohmmeter, chec

7FIGURE 7 - AD-9™ AIR DRYER ASSEMBLY743913141011218515172017161612232122ENDCOVER252624191782827ITEM DESCRIPTION1 O- RING2 PURGE

85. Following the vehicle manufacturer’srecommended procedures, deactivate the electricalsystem in a manner that safely removes allelectrica

94. Remove the remaining six 3/8" cap screws (16), locknuts (19) and twelve special washers (17) that securethe end cover to the housing (24). Se