Service Manual

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Multi Pro 5800 Page 6 − 71 Electrical System

Traction Speed Sensor

The traction speed sensor is attached to the right side

rear wheel motor (Fig. 103). The sensor provides

ground speed information to the InfoCenter display. In-

formation from the ground speed sensor is used by the

various spray control systems to control application

rate. The sensor uses a magnetically based, Hall Effect

integrated circuit. As the piston group in the wheel motor

turns, the sensor accurately senses the movement of

the pistons passing the sensor. The relationship of the

sensor to the rotating piston group is critical as the sen-

sor is designed to read movement in one direction and

must be perpendicular to the piston group within three

(3) degrees. The sensor red connector wire (pin A) is the

positive lead, the black wire (pin C) is the ground lead

and the white wire (pin B) is the signal output.

Testing

1. Park machine on a level surface, stop engine and en-

gage parking brake.

2. Disconnect machine wire harness from speed sen-

sor.

3. Test the machine wire harness to the speed sensor:

A. Set the ignition switch to the RUN/PREHEAT po-

sition.

B. Connect a jumper wire across the ground (−) pin

C and the signal (+) pin B (Fig. 104A). Have an assis-

tant watch the InfoCenter Display as you open and

close the connection across the pins multiple times.

Vehicle speed readings other than 00.0 should ap-

pear on the InfoCenter Display.

C. Remove the jumper wire.

D. Use a multimeter set to DC voltage and check for

12 VDC across the supply (+) pin A and ground (−)

pin C of the machine wire harness (Fig. 104B).

E. Turn the ignition switch to OFF.

4. Test the speed sensor:

A sensor test harness is required to quickly check sen-

sor operation without removing the sensor from the

wheel motor.

NOTE: Instructions for fabricating and using a traction

sensor test harness can be found in the Special Tools

section of this chapter or contact your Authorized Toro

Distributor for assistance.

1. RH wheel motor

2. Speed sensor

3. O−ring

Figure 103

Figure 104

1. Machine wire harness

connector

2. Jumper wire

3. Multimeter probe (typ.)

12 VDC