BENDIX SD-08-2412 Manuale Utente

Compressor with up to 25% duty cycle

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 suffi cient 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-008-021 and TCH-008-022, 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.

e.g. Double/triple trailer, 

open highway coach, (most) 

pick-up & delivery, yard or 

terminal jockey, off-highway, 

construction, loggers, concrete 

mixer, dump truck, fi re truck.

e.g. Line haul single trailer 

w/o air suspension, air over 

hydraulic brakes.

e.g. Line haul single trailer 

with air suspension,

 RV,

school bus.

e.g. City transit bus, refuse, 

bulk unloaders, low boys, 

urban region coach, central tire 

infl ation.

5

or

less

5

or

less

8

or

less

12

or

less

Recom-

mended

Every

Month - 

Max of 

every 90 

days

Every

Month

Every 3

Years

Every 2

Years

Every

Year

Column 1

Column 2

Column 3

Column 4

Column 5

Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging system.

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.

6 ft.

1/2 in.

9 ft.

1/2 in.

12 ft.

1/2 in.

5/8 in.

12 ft.

BASIC

™

 test

acceptable 

range:

5 oil units

per month.

See 

appendix

A.

For oil carry-over 

control

4 

suggested 

upgrades:

3/4 in.      15 ft.

For oil carry-over 

control

4 

suggested 

upgrades:

5/8 in.      15 ft.

For oil carry-over 

control

4 

suggested 

upgrades:

5/8 in.      9 ft.

For oil carry-over 

control

4 

suggested 

upgrades:

5/8 in.      12 ft.

Compressor with less than 15% duty cycle

Compressor with up to 25% duty cycle

Compressor with up to 25% duty cycle

, 

™ 

Bendix

®

 

BASIC

™

 test

acceptable 

range:

3 oil units

per month.

See 

appendix

A.