Symptom: | What it may indicate: | What you should do: |
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4.0Oil 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
See Table A, on page 18, for maintenance schedule information.
Maintenance
(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 18, 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 18, some oil in the reservoirs is normal.
(a)
Drain all air tanks (reservoirs) into the Bendix® BASIC test cup. (Bendix kit P/N 5013711).
ðDrain all air tanks and check vehicle at next service interval using the Bendix® BASIC test. See Table A on page 18, column 3 and 4, for recommended service schedule.
ðDrain 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 29), 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.
ðIf 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.
ðIf outside the normal range go to Symptom 4.0(c).
Also see the Table A on page 18, column 3 for recommended air dryer cartridge replacement schedule.
Duty cycle too high
(c) Air brake system leakage.
(d)Compressor may be undersized for the application.
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.
ðGo to Test 2 on page 29.
ðSee Table A, column 1, on page 18 for recommended compressor sizes.
ðIf 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.
ðIf the compressor is correct for the vehicle, go to Symptom 4.0 (e).
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