24 SEBU7901-01 Operation Section Gauges and Indicators Gauges and Indicators 3. Check the oil level. Maintain the oil level at the proper amount. If the gauge continues to fluctuate, consult your Caterpillar dealer. i01465281 Gauges and Indicators The diagnostic lamp will turn on if the oil pressure drops below 35 kPa (5 psi) at low idle rpm. The diagnostic code will be logged in the Engine Control Module (ECM). SMCS Code: 1900; 7450 Your engine may not have the same gauges or all of the gauges that are described. For more information about the gauge package, see the literature that is provided by the OEM. Engine Oil Temperature This gauge indicates the engine oil temperature.
An oil temperature that is higher than normal indicates a heat problem in the lubrication system and/or the cooling system. This problem can damage the cylinder heads, the cylinder liners, the pistons, and the crankshaft bearings. 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 indicate potential gauge or engine problems. Problems may also be indicated by gauge readings that change even if the readings are within specifications. Determine the cause of any significant change in the readings.
Then, correct any cause of any significant change in the readings. Consult your Caterpillar dealer for assistance. Jacket Water Coolant Temperature Typical temperature range is 88 to 102 °C (190 to 215 °F). The maximum allowable temperature with the pressurized cooling system is 105 °C (220 °F). Higher temperatures may occur under certain conditions. The water temperature reading may vary according to load. The reading should never exceed the boiling point for the pressurized system that is being used. Caterpillar requires one lamp in addition to the gauge package that is normally provided. The “Diagnostic” lamp is yellow or amber.
The “Diagnostic” lamp will communicate the status of the engine’s electronic system. The optional red “Warning” lamp is also available. This red “Warning” lamp warns the operator of engine problems. If the engine is operating above the normal range or steam becomes apparent, perform the following procedure: 1. Reduce the load and the engine rpm. 2. Inspect the cooling system for leaks. The following conditions are some examples of the engine problems: Low oil pressure 3. Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load. High coolant temperature Low coolant level High inlet air temperature Pressurized System:
Hot coolant can cause seri- ous burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pres- sure. Engine Oil Pressure Typical oil pressure for an engine at rated speed with SAE 10W30 or with SAE 15W40 is 240 to 480 kPa (35 to 70 psi). 4. Check the coolant level. A lower oil pressure is normal at low idle. If the load is stable and the gauge reading changes, perform the following procedure: Tachometer This gauge indicates engine speed. When the throttle control lever is moved to the full throttle position without load, the engine is running at high idle.
The engine is running at the full load rpm when the throttle control lever is at the full throttle position with maximum rated load. 1. Remove the load. 2. Reduce engine speed to low idle.