Toro 03200 Reelmaster 3100-D, Service Manual

Page: 253 / 385

High Temperature Warning Switch
g342502
Figure 130
1. Temp. warning switch 2. Rear lift tab
The high temperature warning switch ( Figure 130 ) is attached to the water pump
housing on the engine and has a gray wire attached to it. This switch is normally
open and closes when the engine coolant temperature reaches approximately
105°C (220°F). The closed switch causes the high temperature warning light on
the console to illuminate and also provides an input to the Standard Control
Module (SCM).
This input causes the SCM high temperature warning LED to illuminate and
the cutting unit to shut down. The high temperature warning switch and circuit
wiring should be tested as a SCM input before performing the following testing
procedure.
Testing
1. Park the machine on a level surface, lower the cutting deck, shut off the
engine, set the parking brake, and remove the key from the key switch.
2. Unlatch the hood and raise it.
DANGER
If the radiator or engine is hot, pressurized hot coolant can escape
and cause burns.
Do not open the radiator cap or drain the radiator when the coolant
is hot. Ensure that the engine is cool before removing the high
temperature warning switch from the engine.
3. Lower the coolant level in the engine.
4. Remove the wire harness connector from the high temperature warning
switch, and remove the switch from the engine.
Reelmaster ® 3100-D/3105-D Page 6–29 Electrical System: Component Testing
20252SL Rev A