SEAL-O-RING 2287090 - Caterpillar

Premium Instrument Panel
1. Engine tachometer2. Engine oil pressure3. Fuel pressure4. Engine oil temperature5. Engine jacket water temperatureThe tachometer (1) monitors the engine RPM.Oil pressure reading (2) will be the greatest after starting the engine. Oil pressure will decrease as the engine warms while idling. As the engine speed is increased to the full load speed, oil pressure will increase into the NORMAL range and stabilize.The fuel pressure gauge (3) indicates pressure of the filtered fuel. If the fuel filter gauge registers OUT, clean the primary fuel filter, if so equipped. Install new fuel filter elements.The purpose of the oil is to lubricate all moving parts inside the engine and to cool (remove the heat from) the pistons, liners, and bearings. Gauge (4) indicates the engine oil temperature.Gauge (5) monitors engine water temperature. This gauge may vary according to the load, but should never exceed the boiling temperature for the system being used.Emergency Shutoff Devices and Alarms
Alarms and Shutoff Devices
Alarm systems provide either an audible or a visual warning, or both, when certain abnormal operating conditions occur. These conditions can be low fuel supply, low oil pressure, or high engine coolant temperature. The alarm will be activated until the cause for the condition is corrected. The alarm sensor will then return to its normal position, and shut off the alarm circuit.If no action is taken when the alarm is activated for lack of lubrication or coolant, the engine can be damaged. To prevent this from occurring to unattended engines, shutoff devices should also be used.At a slightly different temperature or pressure range than that which activates the alarm system, the shutoff device stops the engine. The Engine Failure Light on the control panel and one or more of the indicators will either light, or pop out to indicate the problem. Repairs must be made before starting is attempted.Electronic Overspeed Shutoff Switch
This switch uses a magnetic pickup mounted in the flywheel housing to sense engine speed.Low Oil Pressure Shutoff Switch
This device is usually mounted on the side of the engine with oil lines connected to the switch. Low oil pressure closes the switch. Manually operated systems require resetting by pushing the button until it latches. After the engine starts and develops oil pressure, the oil pressure will push the button to the extended running position.
If the reset knob does not move to the extended position after the engine starts, the engine will not be protected by this switch.
If the button remains in the reset position, the engine oil pump is not developing normal oil pressure and a check should be made.Automatic start-stop systems use a pressure switch which resets itself.Overspeed Shutoff
Should the engine overspeed, the magnetic pick-up will close the circuit to the fuel shutoff solenoid and stop the engine.The shutoff switch can be checked for proper operation at 75% overspeed condition:1. Determine the full load RPM of the engine from the serial number plate.2. Operate the engine at the speed shown in the OVERSPEED TEST RPM Column of the