REAR STRUCTURE--1W4219 ARRANGEMENT 6V3777 - 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. For G3306 Engines, the typical oil pressure at rated rpm is 240 to 480 kPa (35 to 70 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 98 °C (190 to 205 °F). Higher temperatures may occur under certain conditions. The engine should operate within the normal temperature range. The sensor for 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.
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.
The inlet manifold air temperature depends on the engine's aspiration and the water temperature regulator for the separate circuit aftercooler (if equipped). If the maximum temperature is exceeded, the engine will be unable to provide rated power. Derating occurs at temperatures that are greater than the maximum. See Table 1 for maximum temperatures of different engines.
Table 1
Maximum Inlet Manifold Air Temperatures for G3300 Engines    
Aspiration     Water Temperature Regulator     Maximum Inlet Manifold Air Temperature    
Naturally aspirated     n/a    
25 °C (77 °F) (1)    
Separate Circuit