SkyTrak 6036 Service Manual - Manual (Page 239)

Section 10. Electrical System
Model 6036 S/N 9B0499 and Before 10-45
d. Inspection and Replacement
Test the sender by suspending its probe in hy-
draulic fluid which is at least 10 °F (5 °C) below
250 °F (99 °C). The sender should remain open.
Increase the temperature of the fluid until it
exceeds this temperature by 10 °F (5 °C). The
sender should close.
e. Installation
1. Install the transmission high temperature
sender.
2. Connect wire to terminal of transmission high
temperature sender.
3. Connect negative (–) cable (2, Fig. 10.38) to
batteries.
4. Operate engine and check transmission for
fluid leaks.
5. Install transmission cover.
10.8.9 Fuel Gauge
The fuel gauge indicates the liquid level in the fuel
tank. It consists of a resistance, float type fuel
level sender, Fig. 10.51, mounted in the top of the
fuel tank and a fuel level gauge in the control
console. The resistance range of the submerged
coil type fuel sender is 0-30 ohms.
The pointer of the fuel gauge is moved by the
magnetic field of two coils. The coils are at right
angles to each other. Battery voltage is applied to
the “E” coil and the circuit divides at the opposite
end of this coil. One path continues to ground
through the “F” coil. Another goes to ground
through the variable resistor of the fuel level
sender.
Fig. 10.51 Fuel Lever Sender and Fuel Gauge Schematic
When the tank is low, the resistance of the sender
is low. A large flow of current passes through the
“E” coil and the fuel level sender resistor. This
moves the pointer toward “E” on the scale. When
the tank is full the sender resistance is high. More
current flows through the “F” coil, moving the
pointer toward “F” on the scale.
With two coils operating the pointer, the gauge is
not affected by changes in the voltage of the
system.
a. Fuel Gauge Testing
1. With five gallons of fuel in the fuel tank, fuel
gauge needle must be at approximately 1/4
full.
2. Use a jumper wire to jump across the two
wires at the fuel level sender on the fuel tank.
Fuel gauge needle must be at FULL mark.
3. Switch ignition key OFF; needle must drop
below EMPTY.
If a fuel gauge malfunctions, perform the following
checks:
1. Check for loose gauge mounting screws,
defective wiring, faulty grounds, and corrosion
on fuel tank ground connection.
2 If pointer in gauge does not move when
ignition key is turned ON, use a test lamp to
see if current is flowing from the ignition switch
to the terminal on the gauge. Also, be sure
paint or corrosion doesn’t prevent proper
ground. If pointer still doesn’t move, gauge is
defective and must be replaced.
3. If gauge doesn’t indicate fuel level in tank, be
sure gauge is 0-30 ohm, 12 V.
17
29
12
2
FUEL LEVEL
SENDER
21
HYDRAULIC
PUMP CASE
GROUND
S G
I
BACK SIDE OF FUEL
GAUGE
TO LIGHTING SYSTEM
FOR OPTIONAL FUEL
GAUGE LIGHT
MA1312