How To Use The Basic Test; Air Brake System Leakage Test - BENDIX DURAFLO 596 COMPRESSOR Manual

Appendix A continued: Information about the BASIC
Filling in the Checklist for the Bendix
STEP C
- How to Use the BASIC
The Technician uses the chart (label) on the
BASIC test cup to help decide the action to take,
™
based on the amount of oil found. Use the lower
acceptance line for low air use vehicles, and upper
line for high air use vehicles (from Step A).
BASIC Test Example
™
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.
The Technician looks for the point where the number
of days since the air tanks were drained meets the
oil level. If it is at or below the (low or high use)
acceptance line, the vehicle has passed the test. If
the point is above the line we go to the leakage test.
STEP D - Air Brake System Leakage Test
Park the vehicle on level ground and chock wheels. Build system pressure to governor cut-out
and allow the pressure to stabilize for one minute.
1: Observe the dash gauges for two additional minutes without the service brakes applied.
2: Apply service brakes for two minutes (allow pressure to stabilize) and observe the dash
gauges.
If you see any noticeable decrease of the dash air gauge readings repair leaks. Repeat
this test to confirm that air leaks have been repaired and return vehicle to service. Please
repeat BASIC test at next service interval. Note: Air leaks can also be found in the charging
™
system, parking brakes, and/or other components - inspect and repair as necessary.
If no air leakage was detected, and if you are conducting
this test after completing Step C, go to Step E.
STEP E
- If no air leakage was detected in Step D
Replace the compressor.
Note: If the compressor is within warranty period,
please follow standard warranty procedures. Attach
the completed checklist to warranty claim.
34
Note: Follow all standard safety precautions. For vehicles using a desiccant air dryer.
Test
™
30-90 days (low air use)
(if the number of days is
unknown, or outside the
Test Kit (Bendix P/N 5013711)
™
®
Air System Inspection Cup (BASIC
1. Record days since air
2. Record amount
tanks were last drained.
_________ days _________ units
if oil level is at or below
If number of days is:
acceptance line for number
30-60 days (high air
of daysè
use) or
if oil level is above
acceptance line for number
è
of days è
if oil level is at or below
Otherwise . . .
30-day acceptance line è
è
if oil level is above 30-day
acceptance line è
limits above)
Acceptance
X
Sixty days since last air
tank draining
) Test
™
3. Action to
of oil found:
take
System OK.
Return to service.
Go to Step D
System OK.
Return to service.
Stop inspection.
Test again
after 30 days.
See Footnote 2.
Lines
Oil
Level
Decision point
Air leakage is the number one
cause of compressors having
to pump excessive amounts of
air, in turn run too hot and
pass oil vapor along into the
system. Here the Technician
conducts a four-minute test to
see if leakage is a problem
with the vehicle being tested.
The Technician only reaches
Step E if the amount of oil
found, for the amount of time
since the air tanks were last
drained exceeds the accep-
tance level, AND the vehicle
passes the four-minute
leakage test (no noticeable
leakage was detected).
STOP
TEST
STOP
TEST
STOP
+ CK.