Location; How It Works; Testing; Hourmeter - Toro 400XT Series Service Manual

ELECTRICAL SYSTEMS

Location

The seat switch is located on the bottom of the seat
(Figure 233).
Figure 233

How It works

When the seat is vacated, the switch is open and there
is no continuity between the two terminals. When the
seat is occupied, the switch closes and there should be
continuity between the terminals.

Testing

1. Disconnect the switch from the wiring harness.
2. With a multimeter, check the continuity between
the two terminals of the switch. There should be
NO continuity.
3. With weight or pressure on the seat, check the
continuity again on the two terminals of the switch.
There should be continuity.
4 - 8

Hourmeter

Purpose

The hourmeter keeps track of the actual engine hours.
This is accomplished by connecting the hourmeter to
the engine oil pressure switch.
Location
The hourmeter is located in the top center of the dash
(Figure 234).
MVC-865F
How It Works
Since a normal clock might be affected by variations in
voltage and current, the hourmeter is made up of a
combination of an electric "winder" and a mechanical
clock movement. When power is applied, a coil is
energized to wind the movement. The movement
unwinds in about 2 seconds. As it finishes its rotation,
it re-energizes the coil so that the cycle can start over.
Testing
Verify that 12 volts is present across the two terminals
when the engine is running. If so, and the meter is not
running, replace the meter. If 12 volts is not present,
check the connections and the engine oil pressure
switch. The meter is a permanently sealed unit and is
not repairable.
Figure 234
400XT Series Tractor Service Manual
MVC-864F