BENDIX BW1811 manual Low Air Use, High Air Use

Appendix A

Table A: Maintenance Schedule and Usage Guidelines

Regularly scheduled maintenance is the single most important factor in maintaining the air brake charging system.

Vehicle Used for:	No. of
	Axles
Low Air Use
Compressor with less than 15% duty
cycle	5
e.g. Line haul single trailer
	or
w/o air suspension, air over
	less
hydraulic brakes.
Compressor with up to 25% duty
cycle	5
e.g. Line haul single trailer
	or
with air suspension,
school bus.	less
High Air Use
Compressor with up to 25% duty
cycle
e.g. Double/triple trailer, open
highway coach/RV, (most)
pick-up & delivery, yard or
terminal jockey, off-highway,	8
construction, loggers, concrete
	or
mixer, dump truck, fire truck.
	less

Compressor with up to 25% duty
cycle
e.g. City transit bus, refuse,
bulk unloaders, low boys,
urban region coach, central	12
tire inflation.
	or
	less

Column 1	Column 2		Column 3	Column 4	Column 5
			Recom-	Recom-	Acceptable
Typical	Discharge		mended	mended	Reservoir
Compressors		Line	Air Dryer	Reservoir	Oil Contents3
Spec'd			Cartridge	Drain	at Regular
	I.D.	Length	Replacement1	Schedule2	Drain Interval

			1/2 in.	6 ft.			BASIC test
		compressor	For oil carry-over				acceptable
			control4 suggested			Recom-	range:
			upgrades:			mended	3 oil units
			5/8 in.	9 ft.
					Every 3	Every	per month.
							See
		air			Years	Month -
			1/2 in.	9 ft.		Max of every	appendix
	compressor
		Tu-Flo®550
			For oil carry-over			90 days	A.
			control4 suggested
			upgrades:
			5/8 in.	12 ft.			For the
	921® air	Bendix®
							BASIC
							Test Kit:
							Order
	-						Bendix
	BA
							P/N
	Bendix®
compressor							5013711
			1/2 in.	12 ft.
			For oil carry-over		Every 2
					Years
® Tu-Flo®750 air
		air compressor	control4 suggested
			upgrades:
			5/8 in.	15 ft.			BASIC test
							acceptable
							range:
							5 oil units
Bendix		596				Every
						Month	per month.
		™					See
		DuraFlo
							appendix
			5/8 in.	12 ft.			A.
		or			Every
		®	For oil carry-over
					Year
		BA-922
			control4 suggested
			upgrades:
			3/4 in.	15 ft.
		Bendix®

Footnotes:

1With increased air demand the air dryer cartridge needs to be replaced more often.

2Use the drain valves to slowly drain all reservoirs to zero psi.

3Allow the oil/water mixture to fully settle before measuring oil quantity.

4To counter above normal temperatures at the air dryer inlet, (and resultant oil-vapor passing upstream in the air system) replace the discharge line with one of a larger diameter and/or longer length. This helps reduce the air's temperature. If sufficient cooling occurs, the oil- vapor condenses and can be removed by the air dryer. Discharge line upgrades are not covered under warranty. Note: To help prevent discharge line freeze-ups, shorter discharge line lengths or insulation may be required in cold climates. (See Bendix Bulletins TCH-08-21 and TCH-08-22.)

5For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size compressor may be permissible.

Note: Compressor and/or air dryer upgrades are recommended in cases where duty cycle is greater than the normal range (for the examples above).

For Bendix® Tu-Flo®550 and 750 compressors, unloader service is

recommended every 250,000 miles.

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