BENDIX BW2377 Data Sheet

Park the vehicle on level ground and chock the wheels. Build system pressure
to governor cut-out and let the pressure stabilize for one minute.
1: Observe the dash gauges for two additional minutes without the service brakes
applied. 2: Release the parking brake and apply the service brakes (you may
use a block of wood to hold the pedal in position).  Allow the air pressure to
stabilize,  and then observe the dash gauges for 2 minutes.  If you see a
noticeable decrease of the readings, repair leaks and repeat this test to confirm
that air leaks have been repaired. Return vehicle to service, but please repeat
BASIC test at next service interval. Note: Leaks can also be present in the
charging system, parking brakes, and/or other components.

1. Record days since air

tanks were last drained.

è

è

è

2. Record amount

of oil found:

An oil level of 4 units in a sixty-day period is within the acceptance area

(at or below the line) for both low and high air use vehicles.  Return the

vehicle to service.

If number of days is:

30-60 days (high air use)

or

30-90 days (low air use)

è

if oil level is at or below

acceptance line for number

of days

è

if oil level is above

acceptance line for number

of days 

è

Otherwise . . .

è

(if the number of days is

unknown, or outside the

limits above)

if oil level is at or below

30-day acceptance line 

è

if oil level is above 30-day

acceptance line 

è

_________ days

_________ units

Footnote 1: Note: Typical air dryer cartridge replacement schedule is every 3 yrs/

300K miles for low air use vehicles and every year/100K miles for high air use vehicles.

Footnote 2: Caution: To get an accurate reading for the amount of oil collected

during a 30 day period, ask the customer not to drain the air tanks before returning.

(Note that 30-90 days is the recommended air tank drain schedule for vehicles

equipped with a Bendix air dryer that are properly maintained.)  If, in cold weather

conditions, the 30 day air tank drain schedule is longer than the customer's usual

draining interval, the customer must determine, based on its experience with the

vehicle, whether to participate now, or wait for warmer weather.  See the cold weather

tips in Bendix Bulletins TCH-008-21 and TCH-008-22 (included in Appendix B of the

Advanced Troubleshooting Guide).

Use the chart (label) on the BASIC test cup to decide the action to take.
Use the lower acceptance line for low air use vehicles, and upper line for high
air use vehicles (from Step A).

cartridge replaced:  If more than one oil unit of water or a cloudy

emulsion mixture is found again, stop the BASIC test and consult the

air dryer's Service Data sheet troubleshooting section.

*

 Note: A confirmed complaint above does NOT mean that the compressor

must be replaced: the full BASIC test below will investigate the facts.

“Relay valve 

Gleaks oil / G malfunctions”  . . . . . . . Gno Gyes*

“Dash valve 

Gleaks oil / Gmalfunctions”  . . . . . . . Gno Gyes*

G“Air dryer leaks oil”  . . . . . . . . . . . . . . . . . . . . . . . Gno Gyes*

G“Governor malfunction”  . . . . . . . . . . . . . . . . . . . . Gno Gyes*

G“Oil in gladhands”  . . . . . . . . . . . . . . . . . . . . . . . . Gno Gyes*

how much oil did you find? ________________________________

G“Oil on ground or vehicle exterior”  . . . . . . . . . . . Gno Gyes*

amount described: ______________________________________

G“Short air dryer cartridge life”

replaces every:  ______________ 

G miles, G kms, or G months

G “Oil in air tanks” amount described:_______________________

We will measure amount currently found when we get to step B of the test.

G“Excessive engine oil loss”amount described:  ______________
Is the engine leaking oil?  . . . . . . . . . . . . . . . . . . . . .

Gno Gyes*

Is the compressor leaking oil?  . . . . . . . . . . . . . . . . .

Gno Gyes*

G Other complaint: ______________________________________

GNo customer complaint.

Note: Follow all standard safety precautions. Only for vehicles using an air dryer.

 Number of Days Since Air Tanks Were Last Drained: ________  Date: ___________Vehicle #: ____________
Engine SN __________________________ Vehicle Used for: _______________Typical Load:________ (lbs.)
No. of Axles: ____ (tractor) ____ (trailer)  No. of Lift  Axles: ____  Technician’s Name: ____________________

Sixty days since last air tank draining

X

Acceptance

Lines

Oil

Level

è

è

è

GThis is a low air use vehicle: Line haul (single trailer) with 5 or

less axles, or

GThis is a high air use vehicle: Garbage truck, transit bus, bulk

unloader, or line haul with 6 or more axles.

1. Park and chock vehicle on level ground. Drain the air system by

pumping the service brakes.

2. Completely drain ALL the air tanks into a single BASIC cup.

3. If there is less than one unit of contents total, end the test now and

return the vehicle to service. Vehicle passes.

(a) Change the vehicle’s air dryer cartridge

 - see Footnote 1,

(b) Conduct the 4 minute leakage test (Step D),

(c) STOP the inspection, and check the vehicle

again after 30 days - see Footnote 2.

Oil

Units

BW2377 ©2004 Bendix Commercial Vehicle Systems LLC.   All Rights Reserved. 8/30/04.  Printed in USA.

Replace the compressor.  Note: If the compressor is within warranty period,

please follow standard warranty procedures.  Attach the completed checklist to

warranty claim.
If, after a compressor was already replaced, the vehicle fails

the BASIC test again, do not replace the compressor again,

instead use the Advanced Troubleshooting Guide to

investigate the cause(s).