Where can I find literature about machine lubrication systems (including lubricant properties/requirements/analysis) in industry and transports? Does anyone have electronic documents on this subject?
Thank you.

There is enough information in the Machinery Lubrication magazine, also published by Noria: www.machinerylubrication.com

The field of applications are so varied and sometimes specific to certain machine or process that I doubt that there is one electronic document that explains everything.

What specific application did you have in mind when you started this forum?

I have in mind general applications where I can apply ferrography tests. But in order to sell this service I have to know quite well lubrication systems and other parametes related with oil analysis for each specific machine, don´t you think?

Duarte, the best you can do to have a more precise knowledge about machinery lubrication is attending a Machinery Lubrication Seminar fdrom Noria. Besides all the good technical information and a very robust manual ; you will be exposed to a proactive way to look at lubrication. You can find information of the global training program at the website. http://www.noria.com/training/training_calendar.asp
There are seminars is several languages and locations around the world almost every month.