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Symptom:
4.0 Oil in Supply or
Service Reservoir
(air dryer installed)
(If a maintained Bendix
®
PuraGuard
system
fi lter or Bendix
®
®
PuraGuard
QC oil
coalescing
fi lter is installed, call
1-800-AIR-BRAKE
(1-800-247-2725) and
speak to a Tech Team
member.)
See Table A, on page
A-3, for maintenance
schedule information.
The duty cycle is the ratio of time the compressor spends
building air to total engine running time. Air compressors
are designed to build air (to "run loaded") up to 25% of the
time. Higher duty cycles cause conditions that affect air
brake charging system performance which may require
additional maintenance. Factors that add to the duty cycle
are: air suspension, additional air accessories, use of an
undersized compressor, frequent stops, excessive leakage
from fi ttings, connections, lines, chambers or valves, etc.
A-6
What it may indicate:
Maintenance
(a) If air brake charging system mainte-
nance has not been performed.
®
That is, reservoir(s) have not been
drained per the schedule in Table
A on page A-3, Column 4 and/or
the air dryer maintenance has not
been performed as in Column 3.
(b) If the vehicle maintenance has
been performed as recommended
in Table A on page A-3, some oil in
the reservoirs is normal.
(a)
Drain all air tanks (reservoirs)
®
into the Bendix
cup.
(Bendix kit P/N 5013711).
Duty cycle too high
(c) Air brake system leakage.
(d) Compressor may be undersized for
the application.
What you should do:
Drain all air tanks and check vehicle at next
service interval using the Bendix
test. See Table A on page A-3, column 3
and 4, for recommended service schedule.
Drain all air tanks into Bendix
cup (Bendix Air System Inspection Cup).
If less than one unit of reservoir contents
is found, the vehicle can be returned to
service. Note: If more than one oil unit
of water (or a cloudy emulsion mixture)
is present, change the vehicle's air dryer,
check for air system leakage (Test 2, on
page A-14), stop inspection and check
again at the next service interval.
See the BASIC
If less than one "oil unit" of water (or water/
cloudy emulsion mixture) is present, use the
BASIC
determine if the amount of oil found is within
the acceptable level.
If within the normal range, return the
™
BASIC
test
vehicle to service. For vehicles with
accessories that are sensitive to small
amounts of oil, consider a Bendix
PuraGuard
If outside the normal range go to Symptom
4.0(c).
Also see the Table A on page A-3, column
3 for recommended air dryer cartridge
replacement schedule.
Go to Test 2 on page A-14.
See Table A, column 1, on page A-3 for
recommended compressor sizes.
If the compressor is "too small" for
the vehicle's role (for example, where a
vehicle's use has changed or service condi-
tions exceed the original vehicle or engine
OE spec's) then upgrade the compressor.
Note: The costs incurred (e.g. installing
a larger capacity compressor, etc.) are
not covered under original compressor
warranty.
If the compressor is correct for the
vehicle, go to Symptom 4.0 (e).
®
BASIC
™
test kit for full details.
™
cup chart on the label of the cup to
®
QC oil coalescing fi lter.
®
™
BASIC
™
test
®
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