THEORY OF OPERATION - CONTINUED
NONELECTRICAL GAUGES, INDICATORS, AND DIPSTICKS
Air Cleaner Indicator. Indicator is mounted on air
inlet elbow. It contains a vacuum sensitive, color
coded piston inside of a calibrated plastic housing.
When air cleaner elements become dirty, air inlet vac-
uum increases and moves the piston so that red
appears in an aperture on the indicator housing. This
indicates that the elements need cleaning or replacing.
After cleaning or replacing, indicator is reset and
green appears at the aperture.
mounted in instrument panel at forward section of
engine hood. Each gauge is connected by air lines to a
section of the dual air tank. Each shows air pressure
for one section of the air tank.
Articulation Indicator. Indicator is mounted behind steering console. It is connected by lever and cable downward
through cab floor and linked to rear frame section. It registers amount of articulation (pivoting) of frame from straight
(0) to half (HALF) to maximum (MAX).