SPIDER & BEARING GP 4V4735 - Caterpillar

Gauges provide indications of engine performance. Ensure that the gauges are in good working order. Determine the normal operating range by observing the gauges over a period of time.Noticeable changes in gauge readings can indicate potential gauge or engine problems. Problems may also be indicated by gauge readings that change even if the readings are within specifications. Determine and correct the cause of any significant change in the readings. Consult your Caterpillar dealer for assistance.Your engine may not have the same gauges or all of the gauges that are described below.
If no oil pressure is indicated, STOP the engine. The engine will be damaged from operating without oil pressure.
Engine Oil Pressure - This gauge indicates the pressure of the engine oil. This pressure will be highest after a cold engine is started. The pressure will decrease as the engine warms up. The pressure will increase when the engine rpm is increased. The pressure will stabilize when the engine rpm and temperature are stable. The typical range at low idle rpm is 186 to 344 kPa (27 to 50 psi). The typical range at rated rpm is 345 to 600 kPa (50 to 87 psi).
Oil Filter Differential Pressure - This gauge indicates the difference in pressure between the inlet side and the outlet side of the engine oil filters. As the oil filter elements become plugged, the pressure will increase. Replace the engine oil filter elements when the oil filter differential pressure reaches 103 kPa (15 psi).
Jacket Water Coolant Temperature - This gauge indicates the temperature of the engine coolant at the outlet for the jacket water. The temperature may vary according to the load. The temperature should never be allowed to exceed the boiling temperature of the pressurized cooling system. The operating range is 88 to 100 °C (190 to 210 °F). Higher temperatures may occur under certain conditions. Engines that use fuel with a low Btu content may have temperatures up to 110 °C (230 °F). Cogeneration engines may have a maximum temperature up to 127 °C (260 °F).The engine should operate within the normal temperature range. The sensor for jacket water coolant temperature must be fully submerged in order to detect the temperature correctly. If the engine is operating above the normal temperature range, perform the following procedure:
Reduce the load and/or the engine rpm.
Inspect the cooling system for leaks.
Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load and/or rpm.
Inlet Manifold Air Temperature - This gauge indicates the inlet manifold air temperature to the cylinders. The sensor for inlet manifold air temperature is located after the aftercooler.
High inlet manifold air temperature increases the risk of detonation. Detonation can cause damage to the engine. Ensure that the aftercooling system is operating properly.
For operating temperatures and shutdown temperatures, see this Operation and Maintenance Manual, "Alarms and Shutoffs" topic (Operation Section).
Inlet Manifold Air Pressure (TA Engines) and Inlet Manifold Vacuum (NA Engines) - For TA engines, this gauge indicates