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4. Thermometer and Thermosensor
1) Specifications (thermosensor) and structure
Part code No. 385720011
Operating range
50°C – 120°C
Standard resistance value (Ω)
(The resistance rating is
measure on the special
circuit.)
35°C → 670±80
80°C → 118±6
105°C → 54.5±2.7
115°C → 4.2±2.5
Electric thermosensor composed of a receiver and
transmitter is used for this tractor.
The receiver employs a thermister in which electric
resistance varies according to temperature to increase the
current flowing the circuit when the cooling water
temperature rises and indicator of the receiver indicates the
corresponding position.
2) Inspection
(1) Thermosensor
a. Remove the thermosensor from the thermostat case.
b. Connect a circuit tester to the thermosensor.
c. Measure the resistance value at each temperature
while heating with a heater.
(2) Thermometer
a. Disconnect the wiring from the themosensor.
b. Turn the key switch to “ON” position. (No start the
engine).
c. Connect the wiring for thermosensor to ground.
d. If the pointer for the thermometer moves to “C” to
“H” after a while, the thermometer is normal. If the
pointer does not move, the wiring or the
thermometer is defective.
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