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®
®
™
Bendix
ET- S
& ET-S2
ACTUATOR BODY
MOUNTING
PLATE
CONNECTOR
TREADLE
ET-S
™
FIGURE 1 - ET-S
AND ET-S2
DESCRIPTION
™
™
The ET-S
and ET-S2
bulkhead mounted electronic treadles. On electronically
controlled diesel engines, the electronic treadle fulfills the
same function as a conventional mechanical throttle.
However, rather than transmitting a mechanical force to the
engine governor, the electronic treadle controls engine speed
by supplying a variable electrical voltage to the engine's
electronic controller.
The main components of the ET-S
are: a mounting plate, suspended treadle, potentiometer
(variable resistor), actuator body and base. The selected
potentiometer, chosen for a specific engine application,
provides the electrical link to the engine control system.
OPERATION
The electronic treadles provide smooth, graduated throttle
control through the function of its potentiometer (variable
resistor). The drive shaft of the cam follower assembly
transfers any movement of the treadle to the potentiometer.
™
Suspended Electronic Treadle
ACTUATOR BASE
POTENTIOMETER
MOUNTING
™
TREADLE
™
ELECTRONIC TREADLES
treadles are engine compartment
™
™
and ET-S2
TREADLE
MOUNTING
PLATE
PLATE
CLOSED
THROTTLE
IDLE (OPEN)
OPEN
THROTTLE
(FULL)
FIGURE 2 - OUTPUT VOLTAGE, AS A PERCENTAGE OF
SUPPLY VOLTAGE
8V
treadles
5V
ET-S
™
TREADLE
OUTPUT
VOLTAGE
0V
CLOSED THROTTLE
(OPEN)
FIGURE 3 - OUTPUT VOLTAGE
POTENTIOMETER
TREADLE PIVOT PIN
TREADLE
™
ET-S2
TREADLE
DETROIT
CATERPILLAR
DIESEL
7 - 18%
10 - 20%
74 - 90%
75 - 90%
CATERPILLAR
DETROIT
CUMMINS
DIESEL
OPEN THROTTLE
CUMMINS
5 - 17%
70 - 81%
MAX
RPM
IDLE
(FULL)
1
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Table of Contents
Related Manuals for BENDIX ET-S SUSPENDED ELECTRON TREADLE
Summary of Contents for BENDIX ET-S SUSPENDED ELECTRON TREADLE
- Page 1 ® ® ™ ™ Bendix ET- S & ET-S2 Suspended Electronic Treadle TREADLE POTENTIOMETER MOUNTING PLATE ACTUATOR BODY TREADLE PIVOT PIN MOUNTING PLATE ACTUATOR BASE CONNECTOR TREADLE TREADLE POTENTIOMETER MOUNTING PLATE ™ ™ ET-S TREADLE ET-S2 TREADLE ™ ™ FIGURE 1 - ET-S...
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Page 2: Preventive Maintenance
If the electronic treadle fails to function as described, it should In the full, or “Open Throttle” position, the driver has be repaired or replaced with a new or genuine Bendix remanu- depressed the treadle to its furthest possible point. This is factured unit, available at any authorized parts outlet. -
Page 3: Cleaning And Inspection
ACTUATOR BASE POTENTIOMETER MOUNTING PLATE #10 SCREWS RETAINING RING NYLON WASHER ACTUATOR TREADLE BODY REPLACEABLE RUBBER COVER TREADLE ™ (ET-S TREADLE ONLY) SPRING NYLINER PIVOT PIN ™ BEARING ET-S TREADLE TREADLE PIVOT PIN NYLINER BEARING TREADLE NYLON WASHER RETAINING RING ™... -
Page 4: Position Sensor
3. Inspect the cable assembly for loose or frayed wires, potentiometer clockwise until the first set of mounting physical damage, or any contaminants on the connec- holes align. Secure using two screws: torque to 25 (±5) tors. Replace as necessary. in. -
Page 5: Operational Test
Closed Throttle (open) Range: 5-17% DIODES SUPPLY Open Throttle (full) Range: 70-81% TEST VOLTAGE TEST LOAD LOAD LOCK TAB PIN 6 V3 (LOGIC HIGH AT IDLE) POTENTIOMETER PIN 2 V2 (LOGIC LOW AT IDLE) SET VOLTAGE IDLE AND PC. NO. VALIDATION PIN 1 IVS GROUND... -
Page 6: Personal Injury Or Death
1. Park the vehicle on a level surface, apply the ranges, it should be repaired or replaced with a new or parking brakes, and always block the wheels. genuine Bendix remanufactured unit, available at any Always wear safety glasses. authorized parts outlet. - Page 7 ® 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.
- Page 8 BW1837 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 6/2004 Printed in U.S.A.