BASE AS 5047404 - Caterpillar

Personal injury or death can result from high voltage.Moisture can create paths of electrical conductivity.Make sure that the electrical system is OFF. Lock out the starting controls and tag the controls "DO NOT OPERATE".
Accumulated grease and oil on an engine is a fire hazard. Keep the engine clean. Remove debris and fluid spills whenever a significant quantity accumulates on the engine.
Failure to protect some engine components from washing may make your engine warranty invalid. Allow the engine to cool for 1 hour before washing the engine.
Periodic cleaning of the engine is recommended. Steam cleaning the engine will remove accumulated oil and grease. A clean engine provides the following benefits:
Easy detection of fluid leaks
Maximum heat transfer characteristics
Ease of maintenanceNote: Caution must be used in order to prevent electrical components from being damaged by excessive water when the engine is cleaned. Pressure washers and steam cleaners should not be directed at any electrical connectors or the junction of cables into the rear of the connectors. Avoid electrical components such as the alternator and the starter. Protect the fuel injection pump from fluids in order to wash the engine.