BENDIX BW1662 manual Technical Information, Preventive Maintenance, Service Checks

feature allows the WS-20™sensor to "self adjust" after it has been installed in the mounting block and the wheel is installed.

When the WS-20™sensor is inserted all the way into the mounting block and the wheel is installed on the axle, the hub exciter contacts the sensor, which pushes the sensor back. Also, normal bearing play will "bump" the sensor away from the exciter. The combination of these two actions will establish a running clearance or air gap between the sensor and exciter.

PEAK TO PEAK

LOW SPEED

PEAK TO PEAK

HIGH SPEED

FIGURE 2 - SPEED SENSOR VOLTAGE CYCLE OUTPUT

TECHNICAL INFORMATION

Electrical Connector-	2 Pin.
Output Voltage-	With a 3,000 Ohm resistor across
	the two sensor leads, output voltage
	measured on a VOM = .800 VAC
	Minimum at 42 Hz, or
	approximately 5 mph.
Sensor Gap-	0 to .015 inch.
Sensor Body-	Formulated Epoxy; .628" Diameter.
Normal Resistance
Range at Room Temp-	2000-2500 ohms

PREVENTIVE MAINTENANCE

1.Every 3 months; 25,000 miles; 900 operating hours; or during the vehicle chassis lubrication interval, make the visual inspections noted in "SERVICE CHECKS" below.

2.Every 12 months; 100,000 miles; or 3600 operating hours, perform the OPERATIONAL TEST in this manual.

SERVICE CHECKS

Check all wiring and connectors. Make sure connections are free from visible damage.

Examine the sensor. Make sure the sensor, mounting bracket, and foundation brake components are not damaged. Repair/replace as necessary.

ANTILOCK CONTROLLER

& RELAY

WS-20™SPEED SENSORS

EXCITERS

FRONT WHEEL

REAR WHEELS

FIGURE 3 - TYPICAL ANTILOCK SYSTEM

WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following general precautions should be observed at all times.

1.Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Always wear safety glasses.

2.Stop the engine and remove ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components.

3.Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.

4.If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from

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