Maintenance Schedule And Usage Guidelines - BENDIX BA-922 COMPRESSOR Manual

Table A: Maintenance Schedule and Usage Guidelines
Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging
Vehicle Used for:
Low Air Use
Compressor with less than 15% duty
cycle
e.g. Line haul single trailer
w/o air suspension, air over
hydraulic brakes.
Compressor with up to 25% duty cycle
e.g. Line haul single trailer
with air suspension,
school bus.
High Air Use
Compressor with up to 25% duty cycle
e.g. Double/triple trailer, open
highway coach/RV, (most)
pick-up & delivery, yard or
terminal jockey, off-highway,
construction, loggers, concrete
mixer, dump truck, fire truck.
Compressor with up to 25% duty cycle
e.g. City transit bus, refuse,
bulk unloaders, low boys,
urban region coach, central
tire inflation.
Footnotes:
1. With increased air demand the air dryer cartridge needs to be
replaced more often.
2. Use the drain valves to slowly drain all reservoirs to zero psi.
3. Allow the oil/water mixture to fully settle before measuring oil
quantity.
4. To counter above normal temperatures at the air dryer inlet, (and
resultant oil-vapor passing upstream in the air system) replace the
discharge line with one of a larger diameter and/or longer length.
This helps reduce the air's temperature. If sufficient cooling occurs,
the oil-vapor condenses and can be removed by the air dryer.
Discharge line upgrades are not covered under warranty. Note:
To help prevent discharge line freeze-ups, shorter discharge line
lengths or insulation may be required in cold climates. (See Bendix
Column 1
Typical Discharge
Compressors
No. of Spec'd
Axles
I.D.
(See footnote 7)
1/2 in.
5
For oil carry-over
or
control
less
5/8 in.
1/2 in.
5
For oil carry-over
or
control
less
5/8 in.
1/2 in.
8
For oil carry-over
or control
upgrades:
less
5/8 in.
3/4 in.
12
or
less
Column 2 Column 3
Recom-
mended
Line Air Dryer
Cartridge
Replacement
Length
6 ft.
suggested
4
upgrades:
9 ft.
Every 3
Years
9 ft.
suggested
4
upgrades:
12 ft.
12 ft.
Every 2
Years
suggested
4
15 ft.
12 ft.
Every
Year
Bulletins TCH-08-21 and TCH-08-22, included in Appendix B, for
more information.)
5. For certain vehicles/applications, where turbo-charged inlet air is
used, a smaller size compressor may be permissible.
6. Note: Compressor and/or air dryer upgrades are recommended
in cases where duty cycle is greater than the normal range (for
the examples above).
7. For correct compressor upgrades consult Bendix - Please note
that because a compressor is listed in the same area of the chart
does not necessarily mean that it would be a suitable candidate
for upgrade purposes.
For Bendix Tu-Flo 550 and 750 compressors, unloader service is
® ®
recommended every 250,000 miles.
Column 4 Column 5
Recom- Acceptable
mended Reservoir
Reservoir Oil Contents
Drain at Regular
Schedule Drain Interval
1 2
BASIC test
acceptable
range:
Recom-
3 oil units
mended
per month.
Every
See
Month -
appendix
Max of ev-
A.
ery 90 days
For the
BASIC
Test Kit:
Order
Bendix
P/N
5013711
BASIC test
acceptable
range:
5 oil units
Every
per month.
Month
See
appendix
A.
3
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