99619 Mariner SHAFT, SHOCK ABSORBER (LOWER)

Always determine the cause of the shutdown. Have the necessary repairs made before restarting the engine.Emergency shutoff controls are for emergency use only. Do not use an emergency shutoff device for a normal stopping procedure.
Electric Shutoff Controls
The operation of all electric shutoff controls is similar: A critical operating condition actuates a switch in the sensing unit. The switch closes the circuit to the shutoff solenoid which moves linkage to stop the fuel to the cylinders; thus stopping the engine. The shutoff control may require resetting before the engine can start.High Water Temperature Shutoff
The shutoff switch is located in the water temperature regulator housing. Excessive water temperature closes the switch. No resetting procedure is required: As the coolant cools, the switch opens.
The sensing element must be submerged in the coolant to operate. A low coolant level cannot actuate the shutoff.
Low Oil Pressure Shutoff Switch
This switch is usually mounted on the side of the engine with oil lines connected to the switch. Low engine oil pressures closes the switch. Manually operated systems require resetting by pushing the reset button until it latches. After the engine starts and develops oil pressure, the oil pressure will push the reset button to the extended running position.
If the reset button 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.Electronic Overspeed Shutoff Switch
This switch uses a magnetic pickup mounted in the flywheel housing to sense engine speed.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 corresponding speed shown in the OVERSPEED TEST RPM Column of the chart below. The Overspeed Test RPM is slower than the Full Load RPM:FULL LOAD RPM × .885 = OVERSPEED TEST RPM 3. While maintaining test RPM, push and hold the VERIFY button. The engine should stop.If the engine does not stop at the specified test RPM, contact your Caterpillar dealer. As the engine stops, the yellow light (2) will go on. The RESET button (1) must be pushed before starting the engine. If the engine is equipped with a CAT Generator Set Control Panel, the devices on the panel must be reset: 1. Turn the Engine Auto. Control Selector switch to OFF/RESET position. 2. Push in on the OVERSPEED indicator to the reset position.Electronic Overspeed Shutoff Switch With Cranking Termination
This switch has a 75% VERIFY button (1), a RESET button (2) and an indicator light (3) similar to the speed switch. The operation of this portion of the switch is identical in all respects to the one just described.In addition, this switch has a second sensing circuit which prevents the starter pinion from remaining engaged in the flywheel at excessive RPM.After the starting motor has cranked the engine, the pinion gear can remain engaged with the flywheel as engine speed increases. At 600 RPM, the magnetic pickup opens the circuit to the starter motor which allows the pinion to disengage. The circuit remains open until the flywheel stops. This prevents energizing the starter motor again while the flywheel is turning.Overspeed Shutoff Switch (Electro-Mechanical)
This switch is mounted either on the tachometer drive or on the governor. Excessive engine speed closes the switch by centrifugal force. To reset the switch, push the button marked RESET. The knob will remain down until the engine overspeeds.Determine Cause of A Shutdown
If the engine has been shut down by a safety device, do not start the engine without having the cause of the shutdown corrected.