BENDIX ET-2 ELECTRONIC THROTTLE Manual - Página 2

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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

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 AD-IS

air dryer system or a dryer reservoir module, be

sure to drain the purge reservoir.

5. Following

the

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

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.

AVOID

vehicle

manufacturer's

replacement parts,

FIGURE 4 - EXPLODED VIEW

PREVENTIVE MAINTENANCE

GENERAL

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Perform the following tests and inspections at the prescribed

intervals. If the ET-2

repair it or replace it with a new unit, available at any

authorized Bendix parts outlet. EVERY 3 MONTHS, 25,000

MILES, OR 900 OPERATING HOURS:

1. Remove any accumulated contaminants and visually

inspect the exterior of the ET-2

damage or excessive corrosion.

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,

™

treadle does not function as described,

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treadle for physical