Instruments and Controls Operating Instructions
– 30 – Y53-6008
Medium Duty (R10/06)
Air Filter Restriction Indicator (option)
This gauge indicates the condition of the engine air cleaner
and is measured by inches of water. A clean filter should reg-
ister 7 in. of water and a filter whose life is over will register
approximately 25 in.
CAUTION: Do not continue to operate with the
Air Filter Restriction Gauge reading 25 in. (start
of red area). It could lead to damage to the
engine. Inspect the filter and replace if neces-
sary.
Holes in the paper element render an air cleaner useless and
may cause the Air Filter Restriction Gauge to give a false
reading, even if the element is clogged. Replace the element
if it is damaged. See page 167
for information on Air Filter
Replacement.
Headlight Switch
The headlights are controlled by a toggle
switch on the left instrument panel. See
page 17
. When the headlights are ON, the
dash lights, side, and tail lamps are also
on.
For High Beam operation see page 54
.
Air Filter Restriction Indicator
02583
RED
CAUTION
AREA
