Air Filter Restriction Indicator; Hourmeter Gage - GMC 2003 GMT560 T-Series Owner's Manual

Here are four concerns of some operators. None of
these shows a problem with your fuel gage:
•
The gage moves a little when you turn a corner or
speed up.
•
The gage doesn't go back to empty when you turn
off the ignition.
•
At the gas station, the pump shuts off before the
gage reads full.
•
It takes a little more or less fuel to fill up than the
gage indicated.
If you have a diesel engine, also see your Caterpillar
Operation & Maintenance Manual.
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Air Filter Restriction Indicator

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As the filter gets dirty, the yellow indicator will begin to
rise. When it reaches 25 inches of vacuum on the
scale, the filter should be replaced.
After replacing the filter, reset the gage by pressing in
the yellow reset button at the bottom of the gage.
If you have a diesel engine, also see your Caterpillar
Operation & Maintenance Manual.

Hourmeter Gage

If your vehicle has an hourmeter gage, it will be to the
lower left of the steering column, mounted on a
bracket either above or below the fuse block. It shows
the total engine operating time.
This optional gage is
located above the
switchbank in the center of
the instrument panel. It
monitors the engine
air filter.
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