Measure The Charging System Contents - BENDIX TU-FLO 550 COMPRESSOR Manual

Appendix B continued: Information about the BASIC
Filling in the Checklist for the Bendix
The Service Writer fi lls out these fi elds 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
The Service Writer
"Dash valve
also checks off any
complaints that the
customer makes to
how much oil did you fi nd? ________________________________
help the Technician
in investigating.
amount described: ______________________________________
replaces every: ______________
We will measure amount currently found when we get to step B of the test.
Is the engine leaking oil?
Is the compressor leaking oil?
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
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.
leaks oil / malfunctions"
leaks oil / malfunctions"
"Air dryer leaks oil"
"Governor malfunction"
"Oil in gladhands"
"Oil on ground or vehicle exterior"
"Short air dryer cartridge life"
"Oil in air tanks" amount described:_______________________
"Excessive engine oil loss" amount described: ______________
Other complaint: _____________________________________
No customer complaint.
STEP A
Then go to Step B.
STOP
+ CK.
™ Test Kit (Bendix P/N 5013711)
®
Air System Inspection Cup (BASIC
Checklist for Technician
Have you confi rmed
no
no
no
no
no
no
miles, kms, or months
no
no
- Select one:
cup.
™
Note for returning vehicles that are being
re tested 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
consult the air dryer's Service Data sheet
troubleshooting section.
™
) Test
The Technician
yes*
checks boxes
yes*
for any of the
yes*
complaints that
yes*
can be confi rmed.
yes*
yes*
* Note: A confi rmed complaint
above does NOT mean that
the compressor must be
replaced.
The full BASIC
yes*
will investigate the facts.
yes*
The Technician selects the air use
category for the vehicle. This decides
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.
test below
™
test and
™
A-17