High Temperature Shutdown Switch
The high temperature shutdown switch is located on the
waterpumphousing ontherearoftheengineblock(Fig.
6. Install switch to the engine housing.
20).
The shutdown switch has a blue/white wire con-
A. Clean threads of housing and switch thoroughly.
Apply thread sealant to the threads of the switch.
nected to it.
The Standard Control Module monitors the operation of
the high temperature shutdown switch. If the ignition
switch is in the ON position (engine running) and the
high temperature shutdown switch closes due to exces-
sive coolant temperature, the Module Over Tempera-
ture Shutdown input LED should illuminate and the
engine should shut down.
B. Thread switch into the housing. Torque switch
from 16 to 20 ft--lb (21.7 to 27.1 N--m).
C. Reconnect wire to switch.
7.
Fill engine cooling system (see Traction Unit Opera-
tor’s Manual).
Testing
2
1
CAUTION
Make sure engine is cool before removing the
temperature switch.
1.
er coolant level in the engine and remove the tempera-
ture switch.
MakesureignitionswitchisintheOFFposition.Low-
2.
Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 21).
Figure 22
1.
Water pump housing
2.
Shutdown switch
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
3.
Check continuity of the switch with a multimeter
(ohms setting). The high temperature shutdown switch
is normally open and should close between 225 to
235
oF (107 to 113oC).
4.
Allow oil to cool while observing temperature. The
hightemperatureshutdownswitchshouldopenatabout
oF (104oC).
Figure 23
219
5.
Replace switch if specifications are not met.
Groundsmaster 3505--D
Page 5 -- 17
Electrical System
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