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 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 Cat dealer for assistance.
Your engine may not have the same gauges or all of the gauges that are described below.
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If no oil pressure is indicated, STOP the engine. The engine will be damaged from operating without oil pressure. |
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Engine Oil Pressure - This gauge indicates the pressure of the engine oil. The engine oil pressure will be highest after a cold engine is started. The engine oil pressure will decrease as the engine warms up. The engine oil pressure will increase when the engine rpm is increased. The engine oil pressure will stabilize when the engine rpm is stable. The typical range for engine oil pressure at low idle rpm is |
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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, oil filter differential pressure will increase. Replace the engine oil filter elements when the oil filter differential pressure reaches |
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Jacket Water Coolant Temperature - This gauge indicates the temperature of the engine coolant at the outlet for the jacket water. The jacket water coolant temperature may vary according to the load. The jacket water coolant temperature should never be allowed to exceed the boiling temperature of the pressurized cooling system. The operating range for jacket water coolant temperature is |
The engine should operate within the normal temperature range. The sensor for jacket water coolant temperature is 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 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 rpm.
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High inlet manifold air temperature increases the risk of engine damage. Maximum inlet air temperature is |
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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. |
Maintain the aftercooler in good condition. Ensure that the inlet manifold air temperature of an engine at operating temperature does not vary by more than
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Inlet Manifold Air Pressure - This gauge indicates the air pressure (turbocharger boost pressure) in the air plenum (air inlet manifold) after the aftercooler. The inlet manifold air pressure depends on the engine rating, the load, and the operating conditions. |
Pyrometer - The pyrometer indicates the exhaust stack temperature at the exhaust elbows. For engines with two exhaust stacks, the two exhaust stack temperatures may vary slightly. This variation may be due to variation of the sensitivity of the two thermocouples. Maximum exhaust stack temperature can vary from
The pyrometer also indicates the temperature of the exhaust gas of each individual cylinder. These temperatures are measured at the exhaust port of each cylinder head. The exhaust temperature will vary slightly between the cylinders.
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Tachometer - This gauge indicates the engine rpm. |
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To help prevent engine damage, never exceed the high idle rpm. An overspeed can result in serious damage to the engine. The engine can be operated at high idle without damage, but the engine should never be allowed to exceed the high idle rpm. |
Note: The high idle rpm and the full load rpm are stamped on the engine Information Plate.
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Service Hour Meter - The service hour meter indicates the total number of clock hours on the engine. |
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Fuel Pressure - This meter indicates fuel pressure to the fuel injection pump from the fuel filter. The normal fuel pressure range is |
A decrease in fuel pressure usually indicates a dirty fuel filter or a plugged fuel filter. As the fuel filter becomes plugged, there will be a noticeable reduction in engine performance.
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Fuel Filter Differential Pressure - This gauge indicates the difference in fuel pressure between the inlet side and the outlet side of the fuel filter. As the fuel filter element becomes plugged, the difference in pressure between the two sides of the fuel filter increases. Service the fuel filter when the fuel filter differential pressure reaches |
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Air Cleaner Differential Pressure - This gauge indicates the difference in air pressure between the inlet side and the engine side of the air filter element. The air cleaner differential pressure is measured from the air inlet to the turbocharger. As the air filter element becomes plugged, the difference in pressure between the two sides of the air cleaner element will increase. For optimum engine performance, clean the air cleaner elements or replace the air cleaner elements when the air cleaner differential pressure reaches |
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Ammeter - This gauge indicates the amount of charge or discharge in the battery charging circuit. Operation of the indicator should be to the right side of "0"(zero). |
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Engine Oil Temperature - This gauge indicates the engine oil temperature after the oil has passed through the oil cooler. The oil cooler is thermostatically controlled. The oil temperature is controlled by an |
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Cranking Timers - There is a cranking timer which may be used on an Automatic Start/Stop mode. The timer allows the engine to crank for 30 seconds. If the engine does not start within the 30 second interval, the Status Control Module will not activate. This condition indicates a failure to start. |
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Coolant Pressure - This gauge can be used for jacket water pressure or auxiliary water pressure. |
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Urea Pump - A green light indicates that the DEF dosing pump is operating. |
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Urea Pump - Failure/Malfunction - A yellow light indicates that a warning alarm has been received. The dosing pump is operating. |
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Urea Pump - Off/Inactive - A red light indicates that the system has received a shutdown event. The dosing pump has stopped. |