Bendix Commercial Vehicle Systems DURAFLO 596 COMPRESSOR 10/04 User Manual

Page 24

Symptom:

What it may indicate:

What you should do:

8.0 Oil in ping tank
or compressor dis-
charge aftercooler.

Air brake charging system is
functioning normally.

ð 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 by the BASIC

™

Test (see also

column 5 of Table A on page 18). Replace
the air dryer cartridge as needed and return
the vehicle to service.

7.0 Oil present at
air dryer cartridge
during
maintenance.

A problem with engine or other engine
accessory.

ð See engine service manual.

6.0 Excessive oil
consumption in
engine.

Air brake charging system is
functioning normally.

ð Follow vehicle O.E. maintenance

recommendation for these components.

(a) Air brake charging system

functioning normally.

(b) Air brake system leakage.

the application.

(d) Compressor unloader mechanism

malfunction.

(e) Damaged compressor head

gasket.

ð Using dash gauges, verify that the

compressor builds air system pressure
from 85-100 psi in 40 seconds or less with
engine at full governed rpm. Return the
vehicle to service.

ð Go to Test 2 on page 29.

ð See Table A, column 1, on page 18 for

some typical compressor applications. If
the compressor is "too small" for the
vehicle's role, for example, where a
vehicle's use has changed, then upgrade
the compressor. Note: The costs incurred
(e.g. installing a larger capacity
compressor, etc.) are not covered under
original compressor warranty.

ð Go to Test 6 on page 30.

ð An air leak at the head gasket may indicate

a downstream restriction such as a
freeze-up or carbon blockage and/or could
indicate a defective or missing safety
valve. Find blockage (go to 9.0(f) for
details.) and then replace the compressor.
Do not re-use the safety valve without
testing. See Symptom 12.0(a).

9.0 Air brake
charging system
seems slow to
build pressure.

The engine

service

manual has

information.

Oil shown

leaking

from an air

dryer

cartridge.