22. Oil Pressure Gage
a. Location. The oil pressure gage is located in the right-hand side of the instrument panel.
b. Purpose. The oil pressure gage registers the amount of oil pressure in the lubricating oil system, and its markings
are divided into a red and a green area. The gage pointer should be in the green area at all times during operation. If the
pointer does not show pressure, stop the unit immediately and determine the cause.
23. Water Temperature Gage
a. Location. The water temperature gage is located in the right-hand side of the instrument panel.
b. Purpose. The water temperature gage indicates the temperature of the coolant in the liquid cooling system.
Normal operating temperatures are between 180 to 2150 F.
24. Ammeter
a. Location. The ammeter is located in the left-hand side of the instrument panel.
b. Purpose. The ammeter indicates the rate of battery charge or discharge. When the engine-compressor is running
at normal speed, the ammeter needle should be in the charge range. If the ammeter shows discharge continuously, check
the condition of the generator, voltage regulator, and batteries to determine the cause.
25. Hourmeter
a. Location. The hourmeter is located in the left-hand side of the instrument panel.
b. Purpose. The hourmeter records the elapsed time during which the unit has been in operation. It tells exactly
when the unit should have the "preventive maintenance" services required to keep it in continued operation. Mounted on
the instrument panel, the hourmeter is electrically operated and is connected to the ignition switch. The hourmeter
operates only when the engine is in operation.
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