PUMP GP-PISTON 2435639 - Caterpillar

Your engine may not have the same or all of the gauges described. The illustrations shown are of typical gauges. Refer to the OEM Owner Manual for information on the layout of your gauge package. Gauges provide a "look" inside the engine. Be sure they are in good working order. Determine what is the "normal" operating range by observing the gauges over a period of time.Noticeable changes in gauge readings are an indicator 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.
Engine Oil Pressure - Indicates engine oil pressure. The pressure reading will be greatest after starting a cold engine. Oil pressure will decrease as the engine warms while idling. As the engine speed is increased to full load speed, oil pressure will increase and stabilize. Minimum engine oil pressure is 275 kPa (40 psi) at rated speed.
Tachometer - Indicates engine rpm. When the governor control lever is moved to the full speed position without load, the engine is running at high idle.When the engine governor control lever is at the full speed position with maximum rated load, the engine is running at the full load rpm (assuming the engine and load are matched).The high idle rpm, and the full load rpm, are stamped on the engine's Information Plate.
Service Hour Meter - Indicates the total number of clock hours the engine has operated.
Engine Jacket Water Temperature - Indicates engine water temperature. The water temperature reading may vary according to load, but should never exceed the boiling temperature for the pressurized system being used. Engine jacket water temperature range is 80° to 100°C (175° to 210°F).
Inlet Air Temperature - Indicates inlet manifold air temperature. As the inlet air increases in temperature, the air expands, less oxygen is available in the cylinders, and less kw (horsepower) is developed. As a result, at full speed position with a full load, the engine may be overloaded. Maximum inlet manifold air temperature is 118°C (245°F).
Exhaust Temperature - Exhaust temperature is measured at the inlet-to-turbo/exhaust manifold. It is an excellent indicator of engine performance and valve temperatures. The inlet-to-turbo temperature should be the first choice as a performance indicator to monitor and record. Exhaust temperatures measured at the inlet-to-turbo are representative of actual valve temperatures for engines with dry manifolds. Inlet-to-turbo temperatures should be monitored frequently. Inlet-to-turbo temperatures should be monitored as often as hourly for some applications or load conditions.For many years, stack exhaust temperatures have been used to assist in accessing engine performance. The stack exhaust temperature is not a suitable substitute for the inlet-to-turbo data. However, Stack temperature along with inlet-to-turbo temperature can provide a means of accessing turbocharger performance. It is recommended that inlet-to-turbo temperature ports be installed and customers trained in the proper interpretation of cylinder and inlet-to-turbo temperatures. Cylinder Port TemperaturesCylinder port