Neutral Switch - Toro Multi Pro 1750 Service Manual

Neutral Switch

The neutral switch is a normally open switch that is
closed when the transmission is in the neutral position.
The neutral switch is attached to the front of the trans-
mission (Fig. 38).
The Toro Electronic Controller (TEC) monitors the op-
eration of the neutral switch (input).
The neutral switch is used in the engine start inter-
lock system to make sure that the transmission is in
neutral before starting the engine.
The neutral switch is used in the engine run interlock
system to make sure that the transmission is in neu-
tral if the clutch pedal is fully released (engaged) and
the parking brake is engaged, preventing the Opera-
tor from driving the machine with the parking brake
engaged.
The neutral switch position is used in the throttle lock
and speed lock systems.
Testing
The neutral switch and its circuit wiring can be tested as
a TEC input or qualifier using the InfoCenter Display
(see InfoCenter Display − Diagnostics Screen in this
chapter). If testing determines that the switch and circuit
wiring are not functioning correctly, proceed with the fol-
lowing test procedure:
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
2. Locate neutral switch on the front of the transmis-
sion. Disconnect the wire harness connector from the
switch.
3. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the switch connector
terminals.
4. With the range selector in the neutral position, the
neutral switch should be closed (zero ohms resistance).
Electrical System
4
3
1
1. Neutral switch
2. O−ring
5. While watching the multimeter, move the range se-
lector out of the neutral position. Continuity of the neutral
switch should be broken as the selector is moved out of
neutral and the neutral switch opens (infinite ohms re-
sistance).
6. If testing determines that the neutral switch is faulty,
replace neutral switch.
7. If the neutral switch tests correctly and a circuit prob-
lem still exists, check wire harness (see Electrical Sche-
matic and Wire Harness Drawings in Chapter 10 −
Electrical Drawings in this manual).
8. When testing is complete, connect the wire harness
connector to the neutral switch.
Adjustment (Fig. 38)
Two (2) shim thicknesses are available that allow the
neutral switch to be adjusted if necessary (items 4 and
5). Install shims between the switch body and O−ring as
needed until neutral switch operation is correct as de-
scribed in Testing above.
Page 5 − 38
2
Figure 38
3. Shim (0.012" / 0.3 mm)
4. Shim (0.008" / 0.2 mm)
Multi Pro 1750