Traction Pedal Position Sensor - Toro Groundsmaster 4500-D Series Service Manual

Traction Pedal Position Sensor

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
g309423
1. Traction pedal
The traction pedal position sensor is connected to the traction pedal assembly
(Figure 208). This position sensor determines the neutral band for the traction
pedal, the direction of travel desired by the operator and the traction speed. The
position sensor is a single analog, dual digital signal electronic device. The
position sensor portion is a variable resistor that provides an analog signal for
the TEC controller to determine the desired ground speed based on how far the
traction pedal is moved. The traction pedal position sensor also houses two
(2) switches that are used to determine the neutral position (deadband) and
the indicated direction of travel (forward or reverse). As the traction pedal is
depressed, the internal wiper of the position sensor moves and sends the analog
signal to the TEC controller to determine machine direction and speed.
The traction pedal position sensor must be calibrated with the TEC controller to
determine the neutral and full speed set points for both the forward and reverse
directions. The position sensor calibration process can be completed using
the InfoCenter display.
A properly installed and calibrated traction pedal position sensor is critical to
accurate traction response and position sensor life. Use care when installing and
calibrating the position sensor.
Before suspecting a faulty position sensor, the sensor and its circuit wiring
should be tested as a TEC input with the InfoCenter Display (see
Display (page 6–8)). If necessary, follow calibration procedures for the traction
pedal position sensor found in the Adjustments section of this chapter. If position
sensor replacement is necessary, refer to
Figure 208
2. Pedal position sensor
Traction Pedal (page
Page 6–47
InfoCenter
8–7).
Electrical System: Component Testing