DRIVE GP-SWING 5054780 - Caterpillar

Always determine the cause of the engine shutdown. Make necessary repairs before attempting restarting the engine.
Mechanical Oil Pressure and Water Temperature Shutoff
Oil pressure sensing valve (1), water temperature sensing valve (2), shutdown cylinder (3), and shutdown cylinder knob (4).A mechanical shutoff system (if equipped) provides protection for low oil pressure and high water temperature. The main components are an oil pressure sensing valve (1), a water temperature sensing valve (2), and a shutdown cylinder (3). When starting the engine, the shutdown cylinder knob (4) must be pulled out and held until the engine develops enough oil pressure to hold the knob in the extended position. If either low oil pressure or high water temperature is sensed, the knob is released and the plunger in the governor housing moves to hold the fuel rack in the FUEL OFF position.Air Shutoff Solenoid (If Equipped)
This optional solenoid is located on top of the engine in the air inlet system. When the solenoid is activated, the solenoid mechanically shuts off inlet air to the engine. The solenoid can only be activated by the overspeed switch or the emergency stop switch. The air shutoff must be reset before the engine can be restarted.Fuel Shutoff Solenoid
This solenoid is located on the governor or on the fuel injection pump. When the solenoid is activated, the solenoid moves the fuel rack (either directly or through the governor) to the FUEL OFF position.Overspeed Shutoffs
Magnetic pickup, (1), mounted in the flywheel housing (2).A magnetic pickup mounted in the flywheel housing senses the passage of the flywheel ring gear teeth. Should the engine speed increase above the overspeed setting of the Electronic Overspeed Switch (118 percent of rated engine speed), the magnetic pickup will sense the overspeed and send a signal to the Electronic Overspeed Switch. The Electronic Overspeed Switch activates both the air (if equipped) and fuel shutoff solenoids.The shutoffs must be reset before the engine will restart. A reset button on the Electronic Overspeed Switch (in the junction box) must be pushed to open the overspeed switch. The air shutoff lever (at the top of the air inlet housing) must be manually reset.Oil Pressure Switches
Typical example of oil pressure switches, mounted in the rear of the junction box.An oil pressure switch has wires connected to the electrical system for alarm or shutoff functions. The oil pressure switch senses oil pressure at the bearing oil gallery. If sufficient oil pressure is not achieved after engine starting, or if the engine has been running normally and then loses oil pressure, the fuel shutoff solenoid is energized to shut the engine off. No resetting procedure is required.Engine Step Oil Pressure
This is an adjustable engine speed setting that protects the engine from a failure caused by too little oil pressure for a specified speed range. This option requires two different oil pressure switches. One switch has a high pressure rating- when the engine is running above the speed setting, the engine must maintain oil pressure higher than the switch rating. The