Toro Groundsmaster 3500-D Service Manual page 190

High Temperature Warning and Shutdown Switches
The high temperature warning and shutdown switches
are located on the water pump housing, which is located
on the rear end of the engine block. The high tempera-
ture shutdown switch is on the alternator side of the en-
gine (Fig. 26).
Make sure engine is cool before removing the
temperature switch.
1. Lower coolant level in the engine and remove the
temperature switch.
2. Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 27).
Handle the hot oil with extreme care to prevent
personal injury or fire.
3. Check continuity of the switch with a multimeter
(ohms setting).
A. The high temperature warning switch is normally
open and should close between 216 to 226
o
108 C).
B. The high temperature shutdown switch is normal-
ly open and should close between 225 to 235
o
to 113 C).
4. Allow oil to cool while observing temperature.
A. The high temperature warning switch should
o
open at about 208 F (98
B. The high temperature shutdown switch should
o
open at about 219 F (104
5. Replace switch if necessary.
Electrical System (Rev. D)
CAUTION
CAUTION
o
F (102 to
o
F (107
o
C).
o
C).
1. Temp. warning switch
2. Temp. shutdown switch
Page 5 - - 18
3
1
Figure 26
3. Water pump housing
Figure 27
Groundsmaster 3500--D
2
VOA