Lull 944E-42 Service Manual - Manual (Page 752)

Electrical System
9.242 Model 644E-42/944E-42 Rev. 6/04
9.14.17 Fuel Level Gauge and Fuel
Level Sender
The fuel level gauge (1) can be found on the operator’s
dash panel.
The fuel level gauge (1) works in conjunction with the fuel
level sender (2). The submerged, coil-type fuel level
sender is secured to the fuel tank (3) and is connected to
the operator’s dash panel via the cab wiring harness.
The operator’s dash panel fuel level gauge (1) shows the
level of fuel remaining in the fuel tank. The fuel level
sender wiring harness connectors can be accessed at the
right rear corner of the cab.
The fuel level sender (2) consists of a resistance,
float-type fuel level sender mounted in the top of the fuel
tank (3) and the wiring (4) connecting it to the cab
harness (5) which connects the sender to the fuel
gauge (1) in the operator’s dash panel.
The resistance of the fuel sender is 31 ohms for a full tank
of fuel, 101 ohms for 1/2 tank and 255 ohms for an empty
tank. The fuel level gauge in the operator’s dash panel
receives a signal from the fuel level float sender
corresponding to the remaining amount of fuel in the tank.
Examine the fuel level sender circuit in Section 9.10.11,
“Fuel Level Gauge Troubleshooting.”
a. Fuel Level Gauge Testing
1. This test requires an assistant in the operator’s cab.
2. The fuel level sender wiring harness connector (4)
and the cab harness connector (5), can be accessed
at the right rear corner of the cab. Disconnect the
two connectors. With a piece of wire, touch both pins
inside the cab harness connector (5).
3. From the operator’s cab, have the assistant turn the
ignition key switch (6) to the RUN (7) position. DO
NOT start the engine. Observe the fuel level gauge
needle on the operator’s dash panel. The reading
must be at the FULL mark after the engine startup
bulb test is completed.
0000000
RPM X 100
5
10
15
30
20
25
F
1/2
E 104
176
80
248
120 °C
°F
D
r/min
MU0010
1
MU4540
2
3
4
5