Accelerator Potentiometer Adjustment
The accelerator potentiometer is used as one of the in-
puts for the vehicle controller and is attached to the ped-
al frame under the dash (Fig. 13). A collar with roll pin on
the accelerator pedal shaft positions the accelerator po-
tentiometer lever.
4
1
5
If the accelerator potentiometer is out of 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.
3
Adjustment
2
1.
Position vehicle on a level surface, turn on/off switch
OFF and remove key.
2.
attached to the pedal frame of the machine.
Makesurethatacceleratorpotentiometer issecurely
Figure 13
1.
2.
3.
Potentiometer
4.
5.
Roll pin
Set screw (2 used)
Accelerator pedal
Throttle position collar
3.
Check accelerator switch adjustment and adjust if
necessary (see Accelerator Switch Adjustment in this
section).
4.
Check movement of the accelerator potentiometer
lever:
A. With the accelerator pedal released, the roll pin
1
on the throttle position collar should keep the poten-
tiometer lever from 0.050” to 0.100” (1.3 to 2.5 mm)
from the lower stop on the potentiometer body (Fig-
ure 14).
2
B. Withtheacceleratorpedalfullydepressed,thein-
put lever of the potentiometer should not contact the
upper stop on the potentiometer body (Figure 15).
3
Figure 14
1.
2.
3.
Potentiometer lever (accelerator pedal released)
Potentiometer lower stop
Gap of 0.050” to 0.100” (1.3 to 2.5 mm)
5.
location of collar on accelerator pedal shaft:
If potentiometer lever movement is incorrect, adjust
A. Loosen two (2) set screws that secure throttle
position collar to throttle pedal shaft and reposition
collar to allow correct potentiometer movement.
Make sure that there is clearance between roll pin
and side of potentiometer lever to prevent binding.
3
2
1
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.
6.
Calibrate accelerator system after any accelerator
Figure 15
potentiometeradjustment(seeAcceleratorSystemCal-
ibration in this section).
1.
2.
3.
Potentiometer lever (accelerator pedal fully depressed)
Potentiometer upper stop
No lever contact with stop
Electrical System
Workman MDE
Page 3 -- 12
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