BENDIX BW1450 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
e.g. Line haul single trailer	5
with air suspension,	or
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		Every 3	Every	acceptable
			control4 suggested				range:
						Recom-
			upgrades:			mended	3 oil units
			5/8 in.	9 ft.
							per month.
		air			Years	Month -	See
			1/2 in.	9 ft.		Max of every	appendix
	compressor
		550Flo-Tu®
			For oil carry-over			90 days	A.
			control4 suggested
			upgrades:
	921™ air	Bendix®	5/8 in.	12 ft.			For the
							Order
							BASIC
							Test Kit:
	-						Bendix
	BA
							P/N
	Bendix®
compressor							5013711
			1/2 in.	12 ft.
			For oil carry-over		Every 2
air					Years
			control4 suggested
750			upgrades:
			5/8 in.	15 ft.			BASIC test
Tu® -Flo®
		air596
							5 oil units
							acceptable
Bendix		DuraFlo					range:
						Every	per month.
		™
						Month
							See
							appendix
		or	5/8 in.	12 ft.			A.
		™,			Every
		-BA922	For oil carry-over
					Year
			control4 suggested
		Bendix®	upgrades:
			3/4 in.	15 ft.

Footnotes:

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

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

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

4 To 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, included in Appendix B, for more information.)

5 For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size

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.

22

compressor may be permissible.