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Appendix A
Table A: Maintenance Schedule and Usage Guidelines
Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging system.
Vehicle Used for: | No. of | |
Axles | ||
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| |
Low Air Use |
| |
Compressor with less than 15% duty |
| |
cycle | 5 | |
e.g. Line haul single trailer | ||
or | ||
w/o air suspension, air over | ||
less | ||
hydraulic brakes. | ||
Compressor with up to 25% duty |
| |
cycle | 5 | |
e.g. Line haul single trailer | ||
or | ||
with air suspension, | ||
school bus. | less | |
|
| |
High Air Use |
| |
Compressor with up to 25% duty |
| |
cycle |
| |
e.g. Double/triple trailer, open |
| |
highway coach/RV, (most) |
| |
| ||
terminal jockey, | 8 | |
construction, loggers, concrete | ||
or | ||
mixer, dump truck, fire truck. | ||
less | ||
|
Compressor with up to 25% duty |
|
cycle |
|
e.g. City transit bus, refuse, |
|
bulk unloaders, low boys, |
|
urban region coach, central | 12 |
tire inflation. | |
| or |
| less |
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
| |
Typical | Discharge | Recom- | Recom- | Acceptable |
| |
mended | mended | Reservoir | ||||
Compressors |
| Line | Air Dryer | Reservoir | Oil Contents3 | |
Spec'd |
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| Cartridge | Drain | at Regular | |
| I.D. | Length | Replacement1 | Schedule2 | Drain Interval | |
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| 1/2 in. | 6 ft. |
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| BASIC test |
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| compressor |
| For oil |
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| acceptable | |
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| control4 suggested |
| Recom- | range: | ||
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| upgrades: |
| mended | 3 oil units | ||
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| 5/8 in. | 9 ft. |
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| Every 3 | Every | per month. | |||
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| See | |||
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| air |
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| Years | Month - | |
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| 1/2 in. | 9 ft. | Max of every | appendix | ||
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| compressor |
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| For oil |
| 90 days | A. | |||
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| control4 suggested |
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| upgrades: |
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| |||
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| 5/8 in. | 12 ft. |
|
| For the | ||
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| 921® air |
| Bendix® |
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| BASIC | ||
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| Test Kit: | ||
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| Order | ||
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| - |
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| Bendix |
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| BA |
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| P/N | |
compressor |
| Bendix® |
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| 5013711 | ||
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| 1/2 in. | 12 ft. |
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| For oil | Every 2 |
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| |||
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| Years |
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| ||||
Bendix® |
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| |||
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| DuraFlo™ 596 air compressor |
| control4 suggested |
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| |||
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| upgrades: |
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| |||
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| 5/8 in. | 15 ft. |
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| BASIC test | ||
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| acceptable | ||
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| range: | ||
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| Every | 5 oil units | ||
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| per month. | |||
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| Month | |||
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| See | |||
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| appendix | ||
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| 5/8 in. | 12 ft. |
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| A. | ||
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| or |
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| Every |
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| ® |
| For oil |
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| Year |
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| control4 suggested |
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| upgrades: |
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| ||
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| 3/4 in. | 15 ft. |
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| |
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| Bendix® |
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Footnotes:
1With increased air demand the air dryer cartridge needs to be replaced more often.
2Use the drain valves to slowly drain all reservoirs to zero psi.
3Allow the oil/water mixture to fully settle before measuring oil quantity.
4To counter above normal temperatures at the air dryer inlet, (and resultant
5For certain vehicles/applications, where
24
Note: Compressor and/or air dryer upgrades are recommended in cases where duty cycle is greater than the normal range (for the examples above).
For Bendix®
recommended every 250,000 miles.