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Workman MDE Electrical System
Page 3 --
Accelerator Potentiometer Adjustment (Potentiometer with Long Lever)
NOTE: The following adjustment procedure should be
used on vehicles that have a potentiometer with a long
lever (Figure 15.1). If potentiometer has a short lever,
use the procedure on the preceding page.
The accelerator potentiometer is used as one of the in-
puts forthe vehicle controllerand is attached tothe ped-
al frame under the dash (Fig. 15.2). A collar with roll pin
attached to the accelerator pedal shaft positions theac-
celerator potentiometer lever. Potentiometers with a
long lever use a roll pin that extends approximately 3
inches (76 mm) out of the collar.
If theaccelerator potentiometer is outof adjustment, the
diagnostic light on the dash will flash six (6) times. Addi-
tionally, if vehicle movement is erratic and jerky, poten-
tiometer adjustment and calibration of the accelerator
system should be performed.
Adjustment
1. Position vehicle on a level surface, turn on/off switch
OFF andremove key. Makesure thataccelerator poten-
tiometer assembly is securely attached to the pedal
frame of the machine.
2. Check accelerator switch adjustment and adjust if
necessary (see Accelerator Switch Adjustment in this
section).
3. With theaccelerator pedalreleased, inspectlocation
of rollpin on throttle positioncollar andpotentiometer le-
ver.The roll pin shouldjust contactthe potentiometer le-
ver without rotating the lever (Figure 15.2).
4. If necessary, adjust location of collar on accelerator
pedal shaft so that roll pin is properly positioned:
A. Loosen two (2) set screws that secure throttle
position collar to throttle pedal shaft and reposition
collar sothat roll pinon the throttleposition collar just
contacts the potentiometer lever without rotating the
lever. Make sure thatthere is clearance between roll
pin and side of potentiometer lever to prevent bind-
ing.
B. Remove set screws one at a time from collar and
apply Loctite #242 (or equivalent) to set screw
threads. Install and tighten set screws to secure col-
lar to accelerator pedal shaft.
C. Recheck potentiometer lever movement.
5. Calibrate accelerator system after any accelerator
potentiometeradjustment (seeAcceleratorSystem Cal-
ibration in this section).
1. Potentiometer
2. Lever
3. Retainer
Figure 15.1
2
1
3
1. Potentiometer
2. Collar
3. Lever
4. Roll pin
5. Accelerator pedal
Figure 15.2
2
1
3
4
5
Electrical
System
Rev. A12.1