Bendix Commercial Vehicle Systems TU-FLO 750 COMPRESSOR 6/08 User Manual
Page 24
Symptom:
What it may indicate:
What you should do:
24
8.0 Oil in ping tank
or compressor dis-
charge aftercooler.
Air brake charging system is function-
ing normally.
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.
See engine service manual.
6.0 Excessive oil
consumption in
engine.
A i r b r a k e c h a r g i n g s y s t e m i s
functioning normally.
Follow vehicle O.E. maintenance
recommendation for these components.
(a) A i r b r a k e c h a r g i n g s y s t e m
functioning normally.
(b) Air brake system leakage.
(c) Compressor may be undersized for
the application.
(d) Compressor unloader mechanism
malfunction.
(e) D a m a g e d c o m p r e s s o r h e a d
gasket.
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.
Go to Test 2 on page 29.
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.
Go to Test 6 on page 30.
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 more
information.
Oil shown
leaking
from an
air dryer
cartridge.