REGULATOR AS 1966840 - Caterpillar

Stopping the engine immediately after it has been working under load, can result in overheating and accelerated wear of the engine components.If the engine has been operating at highway speeds and/or high loads, run at low idle for at least three minutes to reduce and stabilize internal engine temperature before stopping the engine.
Avoiding hot engine shutdowns will maximize turbocharger shaft and bearing life.Make sure the shutoff procedure is understood. Refer to the OEM truck manufacturer's instructions for your type of engine shutoff system used.Electronic Engines
If your vehicle is equipped with an Electronic engine, DO NOT operate the engine without the rack actuator solenoid (BTM) in place and with the fuel shutoff solenoid disabled. Excessive engine speed (overspeed) may result.
The manual shutoff lever is located on the side of the electronic governor. The engine can be shut OFF by rotating and holding the manual shutoff lever in the counterclockwise (CCW) direction.Rotating and holding the manual shutoff lever in the clockwise (CW) direction overrides the shutoff solenoid. The lever is spring loaded and will return to the neutral position when released.After Stopping the Engine
If freezing temperatures are expected, allow the engine jacket water system to cool; then check the coolant for proper antifreeze protection. The engine must be protected against freezing to the lowest expected outside temperature. Add permanent-type antifreeze if required.