Bendix Commercial Vehicle Systems AD-RP PuraGuard Oil Coalescing Remote Purge Air Dryers - Manual (Page 21)

21
Bendix ® AD-RP ™ AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS CAUSE REMEDY
2. Water and/or oil in
supply or service
reservoir. (continued)
F. Air compressor discharge
and/or air dryer inlet
temperature is too high.
(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 the inlet
components as needed. Note: Dirt ingestion will
damage the compressor and is not covered under
warranty. If you found excessive oil in the service
reservoir and you did not fi nd any issues above,
the compressor may be passing oil. Replace the
compressor and — if still under warranty — follow
the normal warranty process.
G. Compressor malfunction. G. 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. 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
the compressor and — if it is still under warranty —
follow the normal warranty process.
H. Air by-passes the desiccant
cartridge assembly.
H. When replacing the desiccant cartridge, make sure
the desiccant cartridge assembly is properly installed
and sealing rings are in place on the mounting
surface of the desiccant cartridge.
I. Desiccant cartridge requires
replacement.
I. Replace the 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.
4. Air is escaping from
air dryer exhaust
during the charge
cycle but able to build
system air pressure.
(Compressor
pumping.)
A. Air dryer purge valve
leaking.
A. Repair or replace air dryer purge valve.
B. Compressor unloader
mechanism malfunction.
B. One or both dash air gauges should show higher than
normal air pressure. Test the compressor unloader
mechanism for proper operation. Repair or replace
unloaders as necessary.
C. Governor malfunction. C. One or both dash air gauges may show higher than
normal air pressure. Test the governor for proper
operation. Repair or replace as necessary.
(continued)