High Temperature Shutdown Switch
The high temperature shutdown switch is located on the
water pump housing. There is a blue/white wire at-
tached to the shutdown switch.
6. After testing is complete, install switch to the engine
housing.
A. Clean threads of housing and switch thoroughly.
Apply thread sealant to the threads of the switch.
The Standard Control Module monitors the operation of
the high temperature shutdown switch. If the ignition
switch is in the ON position and the high temperature
shutdown switch has closed due to excessive coolant
temperature, the Module Over Temperature Shutdown
input LED should be illuminated 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
CAUTION
Make sure engine is cool before removing the
temperature switch from engine.
1.
Lower the coolant level in the engine and remove the
1
high temperature shutdown switch from the engine.
2.
thermometer and slowly heat the oil (Fig. 16).
Put the end of the switch in a container of oil with a
Figure 14
High temperature switch (gasoline engine)
1.
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
3.
Check resistance of the switch with a multimeter
(ohms setting) as the oil temperature increases. The
high temperature shutdown switch is normally open.
1
A. On the Groundsmaster 3280−D (diesel engine),
the high temperature shutdown switch should close
between 225o and 235oF (107o and 113oC).
Figure 15
High temperature switch (diesel engine)
1.
B. On the Groundsmaster 3320 (gasoline engine),
the high temperature shutdown switch should close
at approximately 238oF (114oC).
4.
Allow oil to cool while observing temperature.
A. On the Groundsmaster 3280−D (diesel engine),
the high temperature shutdown switch should open
at approximately 219oF (104oC).
B. On the Groundsmaster 3320 (gasoline engine),
the high temperature shutdown switch should open
at approximately 232oF (111oC).
Figure 16
5.
Replace switch if specifications are not met.
Electrical System
Page 6 − 14
Groundsmaster 3280−D/3320
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