Steering Home Sensor (4Wd Machines) - Toro Groundsmaster 360 Service Manual

Steering Home Sensor (4WD Machines)

The steering home sensor is used on Groundsmaster
360 machines with 4WD to determine when the wheels
are directed straight ahead. The sensor acts as an input
for the TEC controller to determine when steering can
be changed from 4 wheel steering to 2 wheel steering.
The steering home sensor is a normally open proximity
sensor. The sensor mounts to a bracket that is secured
to the bottom of the front axle near the left side front
steering fork (Fig. 19). The sensing plate for the sensor
is a target bracket attached to the left side front fork.
When the left side front steering fork is in the straight
ahead position, an oval hole in the target bracket is posi-
tioned directly below the steering home sensor allowing
the sensor to be in its normally open state. The sensor
closes when the left side front steering fork is not in the
straight ahead position.
Before performing an adjustment to the steering home
sensor, make sure that front and rear wheels are aligned
in a straight ahead position. A rigid straight edge (e.g.
angle iron or metal pipe) at least 80 inches (2 meters)
long can be used to confirm wheel alignment. Place the
straight edge across the sides of both front and rear tires
to confirm wheel alignment. The straight edge should
contact both front and rear tires at two (2) points when
wheels are aligned (Fig. 20). If necessary, turn steering
wheel until front and rear tires are aligned with the
straight edge. Once front and rear wheels are aligned,
proceed with steering home sensor adjustment.
NOTE: If wheel alignment cannot be achieved by turn-
ing steering wheel, additional adjustment may be re-
quired. See Wheel Alignment in the Adjustments
section of Chapter 6 -- Chassis.
Adjustment
1. When the wheels are in the straight ahead position,
make sure that the steering home sensor is directly over
the oval opening in the target bracket attached to the left
side front steering fork. If necessary, loosen and change
position of sensor bracket so that sensor is directly over
the target bracket opening.
2. The gap between the steering home sensor and the
target bracket should be from 0.150" to 0.170" (3.8 to 4.3
mm). If necessary, loosen jam nuts that secure sensor
to sensor bracket. Position sensor with jam nuts to allow
correct gap between sensor and target bracket. Tighten
jam nuts to secure sensor adjustment. Jam nuts should
be torqued from 162 to 198 in- -lb (18.4 to 22.4 N- -m).
After jam nuts are tightened, make sure that clearance
between head of steering home sensor and the target
bracket has not changed.
Electrical System
3. After adjustment to the steering home sensor, use
the Diagnostic Display to verify that the steering home
sensor and circuit wiring are functioning correctly (see
Steering Home Sensor in the Component Testing sec-
tion of this chapter).
FRONT
1. Front axle
2. LH front steering fork
3. Steering home sensor
4. Target bracket
2
1
1. Straight edge
Page 5 - - 24
1
7
5
6
3
Figure 19
5. Sensor bracket
6. Jam nut (2 used)
7. Lock washer (2 used)
2
2
2
Figure 20
2. Tire contact point
Groundsmaster 360
4
2