TM 5-3805-261-20PRINCIPLES OF OPERATION.1-30.GAGES AND INDICATORS (NON-ELECTRICAL).a.AirCleanerIndicator(Figure 1-55). Mounted on air inlet elbow. Contains a vacuum sensitive, color codedpiston inside of a calibrated plastic housing. When air cleaner elements become dirty, air inlet vacuum increases andmoves the piston so that red appears in an aperture on the housing. This indicates that the elements need cleaning orreplacing. After cleaning or replacing, indicator is reset and green appears at the aperture.Figure 1-55.b.AirPressureGages(Figure 1-56). Mounted in instrument panel at forward section of engine hood. Eachone is connected by air lines to a section of the dual air tank. Each shows air pressure for one section of the air tank.Figure 1-56.c.ArticulationIndicator(Figure 1-57). Mounted behind steering console. Connected by lever and cabledownward through cab floor and linked to rear frame. Registers amount of articulation (pivoting) of frame from straight (0)to maximum (FULL).Figure 1-57.1-49
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