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

 

 

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

 

e.g. Line haul single trailer

5

with air suspension,

or

school bus.

less

 

 

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,

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

 

 

 

Recom-

Recom-

Acceptable

Typical

Discharge

mended

mended

Reservoir

Compressors

 

Line

Air Dryer

Reservoir

Oil Contents3

Spec'd

 

 

Cartridge

Drain

at Regular

 

I.D.

Length

Replacement1

Schedule2

Drain Interval

 

 

 

 

 

 

 

 

 

 

 

1/2 in.

6 ft.

 

 

BASIC test

 

 

 

 

 

 

 

 

 

 

 

compressor

 

 

For oil carry-over

 

 

acceptable

 

 

 

 

control4 suggested

 

Recom-

range:

 

 

 

 

upgrades:

 

mended

3 oil units

 

 

 

 

5/8 in.

9 ft.

 

 

 

 

 

Every 3

Every

per month.

 

 

 

 

 

 

 

 

 

 

 

 

Month -

See

 

 

air

 

 

 

 

Years

 

 

 

 

1/2 in.

9 ft.

Max of

appendix

 

 

 

 

 

 

921air compressor

Bendix® Tu-Flo®550

 

 

 

 

 

 

For oil carry-over

 

every 90

A.

 

 

 

 

days

 

 

 

 

control4 suggested

 

 

 

 

 

upgrades:

 

 

 

 

 

 

5/8 in.

12 ft.

 

 

For the

 

 

 

 

 

 

 

BASIC

 

 

 

 

 

 

 

Test Kit:

 

 

 

 

 

 

 

Order

 

-

 

 

 

 

 

 

 

Bendix

 

BA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P/N

 

®

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5013711

compressor

Bendix

 

 

 

 

 

 

 

 

 

 

1/2 in.

12 ft.

 

 

 

 

 

 

For oil carry-over

Every 2

 

 

 

 

 

Years

 

 

air

 

 

 

 

control4 suggested

 

 

 

 

 

 

upgrades:

 

 

 

Bendix® Tu-Flo®750

 

 

 

 

 

 

 

 

596 air compressor

 

 

5/8 in.

15 ft.

 

 

BASIC test

 

 

 

 

 

 

 

 

 

 

 

 

 

 

acceptable

 

 

 

 

 

 

 

range:

 

 

 

 

 

 

Every

5 oil units

 

 

 

 

 

 

per month.

 

 

 

 

 

 

Month

 

 

 

 

 

 

 

 

 

 

 

 

See

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

appendix

 

 

DuraFlo

 

 

 

 

 

 

 

 

 

 

5/8 in.

12 ft.

 

 

A.

 

 

 

 

 

 

Every

 

 

 

 

, or

 

 

For oil carry-over

 

 

 

 

 

 

Year

 

 

 

 

4

 

 

 

 

 

 

 

control suggested

 

 

 

 

 

BA-922

 

 

 

 

 

 

 

 

 

upgrades:

 

 

 

 

 

 

 

3/4 in.

15 ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bendix®

 

 

 

 

 

 

 

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 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 Bulletins TCH-08-21 and TCH-08-22, included in Appendix B, for more information.)

5For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size compressor may be permissible.

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® Tu-Flo®550 and 750 compressors, unloader service is

recommended every 250,000 miles.

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BENDIX TU-FLO 400-500-1000 AIR COMPRESSOR manual Low Air Use, High Air Use