Multi Pro 5800Page 6 − 76Electrical System
Coolant Temperature Sender
The temperature sender is located on the intake side of
the thermostat housing attached to the engine cylinder
head (Fig. 113). On machines with Gasoline engines,
the temperature sender is a thermistor that is monitored
by the Kubota engine ECU. On machines with diesel en-
gines, the temperature sender is a thermal switch used
in the instrument panel warning light circuit.
To test the temperature sender on machines with gaso-
line engines, see the Kubota WG1605−E3 Workshop
Manual.
Testing (Diesel Engines Only)
Use the following procedure to test the temperature
sender used on machines with diesel engines.
1. Park machine on a level surface, stop engine and en-
gage parking brake. Remove key from ignition switch
and allow engine to cool.
2. Lower engine coolant level below thermostat hous-
ing and remove the temperature sender.
3. Put sender in a container of oil with a thermometer
and slowly heat the oil (Fig. 114).
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
from from the measured value of the temperature send-
er you are testing.
4. Check resistance of the sender with a multimeter
(ohms setting) as the oil temperature increases. The
temperature sender is normally open and should close
between 216 to 226
F (102 to 108 C).
5. Allow oil to cool while observing temperature. The
temperature sender should open at approximately
208 F (98
C).
6. Replace sender if specifications are not met.
1. Temperature sender (diesel engine shown)
Figure 113
1
Figure 114
7. Thoroughly clean threads of thermostat housing and
sender and apply thread sealant to the threads of the
sender. Tighten sender in thermostat housing.
8. Reconnect wire harness to sender.
9. Fill engine cooling system (see Operator’s Manual).
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