High Temperature Shutdown Switch
The high temperature shutdown switch is located on the
water pump housing (Fig. 55). 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 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 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.
8.
Fill engine cooling system.
Lower and secure hood.
The Electronic Control Module (ECM) monitors the op-
eration of the high temperature shutdown switch. The
switch and its circuit wiring should be tested as an ECM
input with the Diagnostic Display (see Special Tools and
Troubleshooting in this chapter).
If excessive coolant temperature caused the ECM to
shut down the engine, the Diagnostic light can be used
to identify the fault (see Diagnostic Light in the Trouble-
shooting section of this chapter).
Testing
1.
stop engine, apply parking brake and remove key from
ignition switch. Open hood to gain access to engine.
Park machine on a level surface, lower cutting units,
1
CAUTION
Figure 55
High temperature 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 inthe engine and remove the
3.
thermometer and slowly heat the oil (Fig. 56).
Put the end of the switch in a container of oil with a
CAUTION
Figure 56
Handle the hot oil with extreme care to prevent
personal injury or fire.
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 -- 42
Reelmaster 5010 Series
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