53
20 - Wheel System, Traction
Maintenance and Adjustments
Drive Pedal Neutral Adjustment
Because the drive pedal potentiometer is set up in a wig-wag configuration, it is necessary to adjust the mid-
point of the potentiometer to coincide with the relaxed position of the physical pedal The Drive Controller
places 5 volts on the potentiometer, and the mid-point neutral position should have 2 5 volts from the
potentiometer wiper
CAUTION: To reduce the risk of inadvertently activating the
drive system, make sure all safety measures are
in place. Always be prepared for the machine to
move unexpectedly.
1 Power-on the machine with technician user level If the machine
errors due to a throttle position error, you may ignore it for now
2 For safety, press the E-Stop button and make sure nothing is on
the operator’s seat that could close the seat switch
3
Navigate to the E4 Drive Controller menu and scroll down to the “Throttle Voltage” status.
4 Make sure the drive pedal is in the center, relaxed position
5 Check the Throttle Voltage listing on the display If it is not 2 8 ± 0 2 volts, adjust the potentiometer
position
a Loosen the two screws that secure the
potentiometer to the pedal housing
b If the voltage is below 2 8V, rotate the
potentiometer body clockwise slightly
c If the voltage is above 2 8V, rotate the
potentiometer body counterclockwise slightly
d Without moving the potentiometer, retighten
the mounting screws
•
Note that the tolerance for the potentiometer
of ± 0 2 volts is narrower than the tolerance
that the drive controller considers the neutral
position (± 0 5 volts) This provides a margin
of error for the actual operation of the pedal during use
E4 Drive Controller
Speed (mph/kph)
Back
Scroll
Throttle %
Throttle Voltage
M11 Current
0.0
0
2.8
0.0
Mounting
Screws
Potentiometer
