Guidelines For Clean Working Conditions

Always clean the connection points and the area around them and then loosen them.
Place removed parts on a clean surface and cover them so that they do not get dirty. Use foil and paper. Only use lint-free cloths.
Only install clean parts: remove the replacement parts from their packaging just before installing them.
Only use greases and sealants that are designated with part numbers.
Carefully cover or seal opened components if the repair is not performed immediately.