Service Manual User Manual

Electrical System
10-83
Model 3606 • Origin 10/99
4. If the fuel level indicators do not illuminate, and a
faulty or defective fuel sender in the fuel tank has
been ruled out, and wiring and connectors have been
checked and ruled out, the operators display panel is
defective and must be replaced in its entirety.
5. Check that the ignition terminal has current, and that
the fuse in the fuse panel is not blown.
6. Check for broken, shorted, frayed, disconnected or
damaged wiring between the fuel level indicator
wiring at the operators display panel, fuse and relay
panel, ignition key switch, and from the fuel sender
on the fuel tank through the wiring in the cab.
7. Check the fuel level sender. The resistance of the
fuel sender is 33.5 ohms for a full tank of fuel and
240 ohms for an empty tank. A defective fuel level
sender in the fuel tank may also prevent the fuel level
indicator bars from illuminating.
Excessive fuel level indicator bar “fluctuation” may be
caused by loose wire connections or a defective fuel
sender in the fuel tank.
A full tank reading at all times may occur if the wiring to
the fuel sender in the tank is broken, if the sender is not
properly grounded, or if the sender is defective.
If the fuel level indicator bars indicate inaccurately, the
fuel sender in the tank may be defective or there may be
low voltage at the fuel level indicator connector to the
operators display panel.
If the fuel level indicator bars fluctuate when other electri-
cal items are used, there may be a defective, corroded or
improper ground. Check the cab harness ground stud
under the dash, the engine to chassis ground, and the
negative (-) battery cable and ground stud cable near the
hydraulic reservoir fill cap under the engine cover.
The cab must be partially removed to access the fuel
tank. See
Section 4 Cab, Covers and Mirrors
in this man-
ual for cab and fuel tank removal instructions.
10.8.24 Hourmeter
The hourmeter (Fig. 10– 109) is a non-repairable instru-
ment that records hours of vehicle engine operation in
tenth of an hour increments and is located on the left out-
side edge of the dash console. The hourmeter is an ana-
log device, similar to an odometer, and will display
99,999.9 hours before resetting to zero.If trouble is sus-
pected, time the hourmeter for six minutes to verify that a
tenth of an hour has been recorded. The meter is
secured to the dashboard with two screws; there are two
wires at the rear of the meter; one is connected to a sen-
sor on the engine, the other provides grounding.
Figure 10– 109. The hourmeter is located on
the left outside edge of the dash console.
a. Hourmeter Removal
Note: For vehicles with the optional closed cab, the front
console must be removed (see
Section 4 Cab, Covers
and Mirrors
) to access the hourmeter.
1. Disconnect the negative (-) battery cable at the
battery (Fig. 10– 110).
2. Remove the two screws securing the hourmeter to
the dash console (Fig. 10– 109). Gently begin
removing the hourmeter from the dashboard until the
two wires are visible. Note or label the wires
respective of their colors and locations. Disconnect
(unplug) both wire terminals at the rear of the
hourmeter.
b. Hourmeter Installation
1. Attach both wire terminals at the rear of the meter.
The black wire attaches to the forward terminal; the
green wire attaches to the rear terminal.
2. Insert the meter into the opening in the left side of the
dash console (Fig. 10– 109). Secure with two screws.
3. Reconnect the negative (-) battery cable (Fig. 10–
110). Start the engine. Observe the hourmeter for
function with the engine running to verify operation.
Time the hourmeter for six minutes to verify that a
tenth of an hour has been recorded.
Figure 10– 110. The negative (-) battery terminal.
OS0750
Hourmeter
OS1040
Negative (-)
Terminal