Bendix Commercial Vehicle Systems AD-9 AND AD-9 IPC AIR DRYERS 4/11 - Manual (Page 24)

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Bendix ® AD-9 ® AND AD-9 ® IPC AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS CAUSE REMEDY
2. Water and/or Oil in Supply
o r S e r v i c e R e s e r v o i r
(continued).
(Continued) Poorly fi ltered inlet air (poor air quality to compressor). Check
for leaking, damaged or malfunctioning compressor air inlet
components (e.g. induction line, fi ttings, gaskets, fi lter bodies,
etc.). Repair inlet components as needed. Note: Dirt ingestion will
damage compressor and is not covered under warranty.
If you found excessive oil present in the service reservoir and you
did not fi nd any issues above, the compressor may be passing oil.
Replace compressor. If still under warranty, follow normal warranty
process.
H. Compressor malfunction. H. If excessive oil is present in the service reservoir and no other
issues (from above) were found, the compressor may be
passing oil. Test the compressor using the Bendix
® BASIC ™
cup method as described in the Bendix compressor service
manual and referred to in Appendix A, Table A, column 5.
Replace compressor. If still under warranty, follow normal warranty
process.
I. Air by-passes desiccant cartridge
assembly.
I. If the vehicle uses a Holset ® compressor, inspect the
feedback check valve for proper installation and operation.
When replacing the desiccant cartridge, make sure desiccant
cartridge assembly is properly installed and sealing rings are in
place on mounting surface of desiccant cartridge.
Typical Drop-In Air Dryer End Cover
Feed Back Line
J. Desiccant requires replacement. J. Replace desiccant cartridge assembly. Refer to Appendix A,
Table A columns 3 & 4 for recommended intervals.
3. Oil present at air dryer purge
exhaust or cartridge during
maintenance.
A. Air brake charging system is
functioning normally.
A. Air dryers remove water and oil from the air brake charging
system. A small amount of oil is normal. Check that regular
maintenance is being performed and that the amount of oil in
the air tanks (reservoirs) is within the acceptable range shown
on the BASIC cup (see also column 5 of Appendix A, Table
A). Replace the air dryer cartridge as needed and return the
vehicle to service.
Check Valve