Groundsmaster 3500--DPage 5 -- 18Electrical System (Rev. D)
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).
CAUTION
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).
CAUTION
Handle the hot oil w ith 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
F (102 to
108
o
C).
B. The high temperature shutdown switch is normal-
ly open and should close between 225 to 235
o
F (107
to 113
o
C).
4. Allow oil to cool while observing temperature.
A. The high temperature warning switch should
open at about 208
o
F(98
o
C).
B. The high temperature shutdown switch should
open at about 219
o
F (104
o
C).
5. Replace switch if necessary.
1. Temp. warning switch
2. Temp. shutdown switch
3. Water pump housing
Figure 26
2
1
3
Figure 27
VOA
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