Temperature Sender
The temperature sender is attached to the water pump
housing on the engine and has a gray wire attached to
it(Fig. 48).The resistance ofthetemperature sender re-
duces as the engine coolant temperature increases.
4. Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases. Replace
sender if specifications are not met.
COOLANT TEMP TEMP SENDER RESISTANCE
The changing resistance of the temperature sender sig-
nals the console temperature gauge to indicate engine
coolant temperature level during machine operation.
When coolant temperature rises to approximately
100
oF (38oC)
160oF (71oC)
oF (93oC)
oF (105oC)
460 ohms (approximate)
140 ohms (approximate)
54 to 78 ohms
200
221
oF (105oC), temperature sender resistance causes
221
50 ohms (approximate)
the temperature gauge to provide an input to the TEC
controller. This controller input causes the high temper-
ature warning light to illuminate and the cutting decks to
shut down. The temperature gauge, temperature send-
er and circuit wiring should be tested as a controller in-
put with the Diagnostic Display (see Special Tools and
Troubleshooting in this chapter).
5.
After testing, install sender to the engine housing.
A. Clean threads of housing and sender thoroughly.
Apply a light coating of thread sealant to the threads
of the sender.
B. Thread sender into the housing. Torque sender
from 16 to 20 ft--lb (22 to 27 N--m).
Iftheexcessivecoolanttemperaturecausedthecontrol-
ler to shut down the cutting decks, the Diagnostic light
can be used to identify the fault (see Diagnostic Light in
the Troubleshooting section of this chapter).
C. Connect wire harness connector to sender.
Fill engine cooling system (see Radiator Installation
intheServiceandRepairssectionofChapter3 -- Kubota
Diesel Engine).
6.
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.
7.
Lower and secure hood.
CAUTION
Make sure engine is cool before removing the
temperature sender from engine.
1
2.
harness connector from temperature sender and re-
move the sender from the engine.
Lower the coolant level in the engine, remove wire
3.
thermometer and slowly heat the oil (Fig. 49).
Put the end of the sender in a container of oil with a
Figure 48
1.
Temperature sender
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
fromfromthemeasured valueofthecomponent youare
testing.
Figure 49
Groundsmaster 4300--D
Page 5 -- 39
Electrical System
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