BENDIX ET-S Handbuch - Seite 2

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As the potentiometer rotates, its resistance changes. This

way, the potentiometer can react to the driver's request for

engine power through the ET-S

changing resistance. The resulting change of voltage is

sensed by the electronic engine controller.

The electronic treadle receives its supply voltage from the

engine control unit. If the driver does not request engine

power, the treadle is in the idle position. This condition is

also referred to as "Closed Throttle." In this state, the

potentiometer returns the minimum percentage of supply

voltage to the engine control unit (see Figure 2).

As the driver depresses the treadle, the electronic treadle

output voltage increases (see Figure 3). The potentiometer

allows an increased amount of its supply voltage to return to

the engine control unit, which in turn increases the engine's

speed.

In the full, or "Open Throttle" position, the driver has

depressed the treadle to its furthest possible point. This is

the state of least potentiometer resistance. The electronic

treadle returns the maximum percentage of supply voltage

to the engine control unit (see Figure 2).

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended warranty

may be voided if intrusive maintenance is performed during

this period.

Because no two vehicles operate under identical conditions,

maintenance intervals will vary. Experience is a valuable guide

in determining the best maintenance interval for a vehicle.

GENERAL

Important:

Visually check for physical damage to the

electronic treadle such as broken or missing parts. Actuate

the pedal five times from stop to stop, noting any binding or

soft pedal response.

Important Note: DO NOT DISASSEMBLE THE ACTUATOR

BODY. Replace the ET-S

any binding, soft pedal actuation or if the nylon washers or

retaining rings indicated in Figure 4 are cracked or have

signs of deterioration.

™

or ET-S2

treadle by

™

or ET-S2

™

treadle if there is

CAM FOLLOWER

DRIVE SHAFT

POTENTIOMETER

MOUNTING PLATE

FIGURE 4 - TOP SECTIONAL VIEW

Perform the inspections presented at the prescribed interval.

If the electronic treadle fails to function as described, it should

be repaired or replaced with a new or genuine Bendix remanu-

factured unit, available at any authorized parts outlet.

Every 3 months, or 25,000 miles, or 900 operating hours:

1. Remove any accumulated contaminants and visually

inspect the exterior of the electronic treadle assembly

for physical damage or excessive corrosion.

2. Inspect electrical connections and cable assembly for

signs of corrosion, wear, or physical damage. Replace

as necessary.

3. Inspect treadle spring, sleeve bearing, nylon washer,

rubber treadle cover (ET-S

ring for cracks or deterioration. Replace as necessary.

™

ET-S

& ET-S2

TREADLE REMOVAL

1. Park the vehicle on a level surface and block the wheels.

2. Drain the air pressure from all vehicle reservoirs.

3. Disconnect the cable assembly of the potentiometer.

Lift the lock tab and pull the connectors until they

disengage.

4. Remove the electronic treadle from the vehicle, set aside

the mounting hardware for reassembly.

DISASSEMBLY

Please note that the internal mechanism of the ET-S

™

ET-S2

treadle are not field-serviceable and therefore

individual parts or parts kits are not available for these

components. Disassembly may lead to malfunction of the

ET-S

™

or ET-S2

™

treadle.

The following instructions cover the maintenance and

replacement of the potentiometer and treadle (with its

bearing, spring etc.) only. The instructions provided with

those items should be followed in lieu of the steps presented

here. There are no other field-serviceable parts.

RETAINING

RINGS

NYLON

WASHERS

™

treadle only) and retaining

™

and