PULLEY AS-IDLER 2304171 - Caterpillar

Your truck/engine may not have the same or all of the gauges as shown in the illustrations. The illustrations shown are of typical gauges.Gauges provide a "look" inside the engine. Be sure they are in good working order. You can determine what is the "normal" operating range by observing your gauges over a period of time.Noticeable changes in gauge readings are an indication of potential gauge or engine problems. This also applies to gauge readings that have changed significantly but are still within specifications. The cause of any sudden or significant change in the readings should be determined and corrected. Contact your Caterpillar dealer for assistance as needed.
If no oil pressure is indicated, stop the engine. Engine damage can result.
Oil Pressure - Typical oil pressure range is 30 and 45 psi (207 and 310 kPa) (running at rated engine speed, with SAE 15W-40 oil, at operating temperature). A lower pressure is normal at low idle. Water Temperature - Typical water temperature range is 189° to 208°F (87° to 98°C). Maximum allowable temperature is 216°F (102°C) with the cooling system pressurized. Somewhat higher temperatures may occur under certain conditions. Ammeter - Indicates the amount of charge or discharge in the battery charging circuit. Typical operation of the indicator should be slightly to the positive (right) side of "0" (zero).With the engine running, during normal operation, if the indicator is constantly to the negative (left) side of "0" (zero) or shows excessive charge, have the charging system checked for malfunction.
Do not exceed 2300 rpm in any situation.
Tachometer - Indicates engine rpm (speed). The engine can be operated at high idle without damage, but should not be allowed to overspeed. Overspeeding when downshifting, going downhill, etc., can result in serious damage to your engine. Fuel Level - Indicates fuel level in the fuel tank. Electrically operated, it registers only when the key switch is ON.
A drop in fuel pressure usually indicates a dirty or plugged fuel filter.
Fuel Pressure - Indicates fuel pressure to the unit injectors. The indicator (if equipped) should register in the NORMAL (green) range. Typical fuel pressure at low idle is 60 psi (410 kPa) and at TEL (Top Engine Limit), 80 psi (550 kPa).