Gauge; Fuel Quantity; Coolant Temperature; Fuel Level Sensor - Kubota B2410 Workshop Manual

9 ELECTRICAL SYSTEM
[8] GAUGE
B2410· B271 0 • B2910 WSM, 12271
The fuel quantity and coolant temperature are
indicated by the ammeters. The ammeters indicate each
amperage flowing through the fuel level sensor (7) for
the fuel quantity detection and through the coolant
temperature sensor (8) for the coolant temperature
detection.
®
(1) Main Switch
(2) Fuse (10 A)
(3) Fuel Gauge
(4) Water Temperature Gauge
(S) Slow Blow Fuse
(6) Battery
(7) FuelLevelSensor
(8) Water Temperature Sensor
(j)
®
®l
12010F90110
(1) Fuel Quantity
12010M90140
.. Fuel Level Sensor
The remaining fuel quantity is detected by the fuel
level sensor installed in the fuel tank and indicated on
the fuel gauge. For detection, a float and a resistor are
used.
As the float (1) lowers, the resistance of the variable
resistor (2) varies. The relation between the amount of
fuel and the resistance is as follows.
12010F90120
E
+----CD
F
1 toSQ
(1) Float
E
103 to 117 Q
(2) Variable Resistor
12490M90060
(2) Coolant Temperature
11790F90S70
.. Coolant Temperature Sensor
The coolant temperature sensor is installed to the
cylinder head of engine, and its tip is in touch with the
coolant. It contains a thermistor (4) whose electrical
resistance decreases as the temperature increases.
Current varies with changes in the coolant
temperature, and the increases or decreases in the
current move the pointer of gauge.
Characteristics of Thermistor
Temperature
Resistance
SO °C (122 OF)
148.8 Q
80°C (176 OF)
SO.3Q
120°C (248 OF)
16.0Q
170°C (338 OF)
S.60
(1) Terminal
(2) Insulator
9-M15
(3)
Body
(4) Thermistor
11790M90310