Figure 3 illustrates the relationship between throttle position and engine RPM. Potentiometer performance will vary for each engine application, therefore potentiometers must not be interchanged.
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 all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with an
5.Following the vehicle manufacturer’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.
6.Never exceed manufacturer’s recommended pressures.
7.Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.
8.Use only genuine Bendix® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. must be of equivalent size, type and strength as original equipment and be designed specifically for such applications and systems.
9.Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer.
10.Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.
FIGURE 4 - EXPLODED VIEW
PREVENTIVE MAINTENANCE
GENERAL
Perform the following tests and inspections at the prescribed intervals. If the
1.Remove any accumulated contaminants and visually inspect the exterior of the
2.Inspect electrical connections and cable assembly for signs of corrosion, wear, or physical damage. Replace as necessary.
3.Inspect springs (11, 12, 13) for signs of corrosion or pitting. Replace as necessary.
4.Inspect bearings (10), washer (7), and snap rings (8) for cracks or deterioration. Replace as necessary.
OPERATIONAL TEST
Perform these tests only if the vehicle’s throttle does not appear to operate as expected.
Test 1: For Mack and DDC engines:
1.Unplug the cable assembly from the potentiometer’s integral connector by lifting the lock tab and pulling the connectors until they disengage. Inspect cable assembly for loose terminals, frayed wires, corrosion,
2
