TM 9-4310-397-14
2-2. INDICATORS. - Continued
h.
Tachometer. The TACHOMETER (18) indicates engine speed in revolutions per minute (RPM). Operating
range is 1000 to 2250 RPM. An overspeed switch is built into the tachometer and is normally open. The switch closes if
the engine speed reach 2350 RPM. This is factory set and not adjustable.
i.
Compressor And Engine Restriction Indicators. The COMPRESSOR (19) and ENGINE RESTRICTION
INDICATORS (20) monitor the air pressure drop through the compressor and engine air cleaner. The red indicator locks-
up at maximum restriction with unit running at full load. Press reset after a new air cleaner is installed to restore indicator
to green.
2-4
