High Temperature Shutdown Switch
The high temperature shutdown switch is located on the
water pump housing (Fig. 50). The high temperature
5. Replace shutdown switch if specifications are not
met.
shutdown switch is normally open and closes when en-
gine coolant temperature reaches approximately 239oF
6.
the engine housing.
After testing is complete, install shutdown switch to
(115
oC). When excessive coolant temperature causes
the shutdown switch to close, the engine shuts down.
There is a tan wire attached to the shutdown switch.
A. Clean threads of housing and switch thoroughly.
Apply a light coating of thread sealant to the threads
of the switch.
NOTE: If excessive coolant temperature causes en-
gine shutdown, the operator can restart the engine to al-
low the machine to be moved a short distance. After a
restart in this condition, the engine will run for approxi-
mately ten (10) seconds before the engine shuts down
again.
B. Thread switch into the housing. Torque switch
from 22 to 28 ft--lb (30 to 39 N--m).
C. Reconnect harness wire to switch.
7.
intheServiceandRepairssectionofChapter3 -- Kubota
Diesel Engine).
Fill engine cooling system (see Radiator Installation
The TEC controller monitors the operation of the high
temperature shutdown switch. The switch and its circuit
wiring should be tested as a controller input with the
Diagnostic Display (see Special Tools and Trouble-
shooting in this chapter).
8.
Lower and secure hood.
If excessive coolant temperature caused the TEC con-
troller to shut down the engine, the Diagnostic light can
be used to identify the fault (see Diagnostic Light in the
Troubleshooting section of this chapter).
Testing
1.
Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from ignition switch. Open and support hood to gain
access to engine.
1
CAUTION
Figure 50
High temperature shutdown switch
1.
Make sure engine is cool before removing the
temperature switch from engine.
2.
high temperature shutdown switch from the engine.
Lower the coolant level intheengine and remove the
3.
thermometer and slowly heat the oil (Fig. 51).
Put the end of the switch in a container of oil with a
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
Figure 51
4.
(ohms setting) as the oil temperature increases. The
Check resistance of the switch with a multimeter
hightemperature shutdown switch isnormally openand
should close from 234o to 244oF (112o to 118oC).
Electrical System
Page 5 -- 40
Groundsmaster 4300--D
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