Measure The Charging System Contents - BENDIX BA-922 COMPRESSOR Manual

Appendix A continued: Information about the BASIC Test Kit (Bendix P/N 5013711)
Filling in the Checklist for the Bendix
The Service Writer fills out these fields with information gained from the customer
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: ____________________
Customer's
complaint?
(Please check all that apply)
"Relay valve  leaks oil /  malfunctions"
The Service Writer
"Dash valve  leaks oil /  malfunctions"
also checks off any
 "Air dryer leaks oil"
 "Governor malfunction"
complaints that the
 "Oil in gladhands"
customer makes to
how much oil did you find? ________________________________
help the Technician
 "Oil on ground or vehicle exterior"
in investigating.
amount described: ______________________________________
 "Short air dryer cartridge life"
replaces every: ______________  miles,  kms, or  months
 "Oil in air tanks" amount described:_______________________
We will measure amount currently found when we get to step B of the test.
 "Excessive engine oil loss" amount described: ______________
Is the engine leaking oil?
Is the compressor leaking oil?
 Other complaint: _____________________________________
 No customer complaint.
BASIC test starts here:
 This is a low air use vehicle: Line haul (single trailer) with 5 or less axles, or
 This is a high air use vehicle: Garbage truck, transit bus, bulk unloader, or line
haul with more than 5 axles.
STEP B

- Measure the Charging System Contents

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.
4. If more than one oil unit of water (or a cloudy emulsion mixture)
is found:
(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.
Otherwise, go to Step C.
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: 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 Bulletins TCH-008-21 and TCH-
008-22 (included in Appendix B of the advanced troubleshooting guide).
Note: Follow all standard safety precautions. For vehicles using a desiccant air dryer.
STEP A
- Select one:
Then go to Step B.
STOP
+ CK.
®
Air System Inspection Cup (BASIC) Test
Checklist for Technician
Have you confirmed
 no  yes*
 no  yes*
 no  yes*
 no  yes*
 no  yes*
 no  yes*
 no  yes*
 no  yes*
Note for returning vehicles that are being
retested after a water/cloudy emulsion
mixture was found last time and the air
dryer cartridge replaced: If more than one
Oil
Units 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.
The Technician
checks boxes
for any of the
complaints that
can be confirmed.
* Note: A confirmed complaint
above does NOT mean that
the compressor must be
replaced.
The full BASIC test below will
investigate the facts.
The Technician selects the air use
category for the vehicle. This de-
cided which of the two acceptance
lines on the cup will be used for the
test below.
For an accurate test, the
contents of all the air tanks on
the vehicle should be used.
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