Coolant Temperature - Kubota ZD221-48 Workshop Manual

ZD221 WSM
[1] FUEL QUANTITY
F
E
3TAAAAB9P022A
[2] COOLANT TEMPERATURE
(1 )
3TRAAAA9P034A
(2) (3) (4)
F
c
V
3EEAAAA1P181B
3EEAAAA 1 P178A
• 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 lowers, the resistance of the variable
resistor varies. The relation between the amount of fuel
and the resistance is as follows.
F 1/2
E (Remaining fuel of
approx. 2.0 L. 0.53
U.S.gal.. 0.44 Imp.gal.)
1 to 5!1 28.5 to 36.5 !1 103 to 117 !1
W1013985
• Coolant Temperature Sensor (Thermo Unit)
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.
Temperature
50°C (122 OF)
153.9 !1
(A)
80°C (176 OF)
51.9!1
100°C (212 OF)
27.4 !1
120°C (248 OF)
16.1
n
*
When galvarnometer shows 0 (Zero).
Condition
Setting Value
(A)
R1 : 54.945 to 55.055
n
V: DC 6.9 to 7.1 V
(1) Terminal C : Coolant or Silicon Oil
(2) Insulator
G : Galvanometer
(3) Body VR : Variable Resistor
(4) Thermistor F: Flow Velocity
(0.14
to
0.15 m/s)
W1021761
• Coolant Temperature Switch
The coolant temperature switch is installed to the
water flange of engine, and its tip is in touch with the
coolant.
The overheat alarm activates when the coolant
temperature goes up more than the specified value.
When the coolant temperature falls below the
specified value, the overheat alarm stops.
Characteristics of Coolant Temperature Switch
Type
Operation Temperature
Horn operates Horn stops
Normally open
120 to 126 DC
(248 to 258 OF)
116 DC
(241°F)
W1020324
5-M11