Neutral Safety Switches; Purpose; Location; How It Works - Toro 22317 Service Manual

Neutral Safety Switches

Purpose

The normally closed ball type switches are used on the
4-spool hydraulic valve. These are safety switches to
make sure the control levers are in the neutral detent
(Fig. 2050).

Location

The neutral switches are threaded into the lower portion
of the 4-spool hydraulic valve, located under the upper
frame assembly (Fig. 2051).
Toro Wheeled CUL Service Manual
4-PAW DIESEL/ELECTRICAL
Fig. 2050 IMG-0547a
Fig. 2051 DSC-3165

How It Works

The switch has a spring loaded ball. When the 4-spool
hydraulic valve control handles for forward and reverse
are in the neutral position, the ball moves into a machin-
ed notch located in the spool. The normally closed
switch then provides a ground to the start circuit. When
the 4-spool valve control handles (forward and reverse
levers) are moved out of neutral, the spool pushes
against the ball end of the switch and opens the ground
circuit which prevents the engine from starting.

Testing

1. Disconnect the switch from the wire harness. The
ball end of the switch should remain installed in the
4-spool hydraulic valve.
2. With the VOM multimeter (ohms setting) leads
connected to the two wire terminals, move the
4-spool hydraulic valve lever to either forward or
reverse position; there should be NO continuity. In
the neutral position, there SHOULD be continuity.
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