BENDIX TU-FLO 400-500-1000 AIR COMPRESSOR manual Step D Air Brake System Leakage Test

Appendix A continued: Information about the BASIC Test Kit (Bendix P/N 5013711)

Filling in the Checklist for the Bendix® Air System Inspection Cup (BASIC) Test

Note: Follow all standard safety precautions. For vehicles using a desiccant air dryer.

STEP C - How to Use the BASIC Test

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).

1. Record days since air		2. Record amount	3. Action to
tanks were last drained.		of oil found:
			take
_________ days		_________ units
è		è	è
If number of days is:		if oil level is at or below	System OK.		STOP
	acceptance line for number
30-60 days (high air			Return to service. TEST
use) or		of daysè
		if oil level is above
30-90 days (low air use)			Go to Step D
	acceptance line for number
è		of days è
Otherwise . . .		if oil level is at or below	System OK.		STOP
	30-day acceptance line è		Return to service.		TEST
è
(if the number of days is	if oil level is above 30-day		Stop inspection.
unknown, or outside the			Test again	STOP
limits above)		acceptance line è	after 30 days.	+ CK.
			See Footnote 2.

BASIC Test Example	Acceptance
		Lines
An oil level of 4 units in a sixty-day period is within the		Oil
		Level
acceptance area (at or below the line) for both low
and high air use vehicles. Return the vehicle to service.	X
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)	Sixty days since last air	Decision point
acceptance line, the vehicle has passed the test. If	tank draining
the point is above the line we go to the leakage test.		Air leakage is the number one
		cause of compressors having
STEP D - Air Brake System Leakage Test		to pump excessive amounts of
		air, in turn run too hot and
Park the vehicle on level ground and chock wheels. Build system pressure to governor cut-out
		pass oil vapor along into the
and allow the pressure to stabilize for one minute.		system. Here the Technician
1: Observe the dash gauges for two additional minutes without the service brakes applied.		conducts a four-minute test to
2: Apply service brakes for two minutes (allow pressure to stabilize) and observe the dash
		see if leakage is a problem
gauges.
		with the vehicle being tested.
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.

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).

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