20
4.0 Oil in Supply or
Service Reservoir
(air dryer installed)
(If a maintained Bendix
®
PuraGuard
®
system filter
or Bendix
®
PuraGuard
®
QC
™
oil coalescing filter
is installed, call
1-800-AIR-BRAKE
(1-800-247-2725) and
speak to a Tech Team
member.)
(a) If air brake charging system
maintenance has not been
performed.
That is, reservoir(s) have not been
drained per the schedule in Table
A on page 17, 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 recom-
mended in Table A on page 17,
some oil in the reservoirs is normal.
ð
Drain all air tanks and check vehicle at next
service interval using the Bendix
®
BASIC
test. See Table A on page 17, column 3
and 4, for recommended service schedule.
ð
Drain all air tanks into Bendix
®
BASIC test
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 28), stop inspection and
check again at the next service interval.
See the BASIC test kit for full details.
If less than one "oil unit" of water (or water/
cloudy emulsion mixture) is present, use
the BASIC cup chart on the label of the
cup to determine if the amount of oil found
is within the acceptable level.
ð
If within the normal range, return the
vehicle to service. For vehicles with
accessories that are sensitive to small
amounts of oil, consider a Bendix
®
PuraGuard
®
QC
™
oil coalescing filter.
ð
If outside the normal range go to
Symptom 4.0(c).
Also see the Table A on page 17, column
3 for recommended air dryer cartridge
replacement schedule.
Maintenance
(a)
ð
Go to Test 2 on page 28.
ð
See Table A, column 1, on page 17 for
recommended compressor sizes.
ð
If the compressor is "too small" for
the vehicle's role (for example, where a
vehicle's use has changed or service
conditions 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.
ð
If the compressor is correct for the
vehicle, go to Symptom 4.0 (e).
Duty cycle too high
Symptom:
What it may indicate:
What you should do:
See Table A, on page 17,
for maintenance
schedule information.
Drain all air tanks (reservoirs)
into the Bendix
®
BASIC test
cup.
(Bendix kit P/N 5013711).
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 fittings, connections, lines, chambers or valves, etc.
(c) Air brake system leakage.
(d) Compressor may be undersized for
the application.
