The Terraplenagem.Net is one of the largest sites in Portuguese on earthworks, earthmoving and heavy machinery, with articles, tips, news, forum, classifieds, all free.

(Earthworks means "Terraplenagem" in Portuguese, hence the name of Terraplenagem.Net)

Some articles about Caterpillar heavy machinery:

In comparative brands and models of different types of machines.

I'm sure you will like!