Bendix Commercial Vehicle Systems AD-SP SYSTEM PURGE AIR DRYER 10/04 - Manual (Page 22)

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BENDIX ® AD-IP ® AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS CAUSE REMEDY
2. Water and/or oil in
the supply or service
reservoir (continued).
E. (Continued) Air Compressor Size - Although the Bendix ®
AD-IP ® air dryer can be used in conjunction with
larger compressors, it was designed primarily for
units rated for up to 30 CFM. It is recommended
that when using the AD-IP air dryer with a
compressor which has a rated displacement
exceeding 30 CFM that an authorized Bendix ®
parts outlet or Bendix marketing representative
be contacted for assistance.
F. Air compressor discharge
and/or air dryer inlet
temperature too high.
F. Restricted discharge line. See Appendix A, Table
A, column 1 & 2 for recommended sizes. If the
discharge line is restricted or more than 1/16”
carbon build-up is found, replace the discharge line.
Replace as necessary.
Discharge Line Freeze-Up. The discharge line
must maintain a constant slope down from the
compressor to the air dryer inlet fitting to avoid low
points where ice may form and block the flow. If,
instead, ice blockages occur at the air dryer inlet,
insulation may be added here, or if the inlet fitting is
a typical 90° fitting, it may be changed to a straight
or 45° fitting. For more information on how to help
prevent discharge line freeze-ups, see Bendix
Bulletins TCH-008-021 and TCH-008-022. Shorter
discharge line lengths or insulation may be required
in cold climates.
Insufficient coolant flow through compressor.
Inspect coolant line. Replace as necessary (Inside
Diameter (I.D.) is 1/2” min.). Inspect the coolant
lines for kinks and restrictions and fittings for
restrictions. Replace as necessary. Verify coolant
lines go from engine block to compressor and back
to the water pump. Repair as necessary.
Restricted air inlet (not enough air to compressor).
Check compressor air inlet line for restrictions,
brittleness, soft or sagging hose conditions etc.
Repair as necessary. Inlet line size is 3/4 ID.
Maximum restriction requirement for compressors
is 25 inches of water. Check the engine air filter and
service if necessary (if possible, check the air filter
usage indicator).
Poorly filtered inlet air (poor air quality to
compressor). Check for leaking, damaged or
malfunctioning compressor air inlet components
(e.g. induction line, fittings, gaskets, filter bodies,
etc.). Repair inlet components as needed.
Note: Dirt ingestion will damage the compressor
and is not covered under the warranty.
If you found excessive oil present in the service
reservoir and you did not find any issues above,
the compressor may be passing oil.
Replace the compressor. If still under warranty,
follow the normal warranty process.