Video is good. It would be better if it was subtitled or dubbed in Portuguese. And with explanation where and when the filming took place.

Across Australia, the wheels of industry turn 24 hours a day, 7 days a week. These machines are tough and the teams of people running them are even tougher. From deep underground, to high in the sky, these heavy metal marvels are essential to our daily lives. But, what happens when these massive machines break down? Teams of mechanics, engineers, fitters, and boilermakers step up to battle against tight deadlines, in some of the harshest working environments on the planet.

"Weren't planned for removal." Yes, they were, which is why they're there. No matter how well-designed, all machinery breaks down on occasion, which is why things like removable gearboxes and motors are used. The owner of the machine might keep spares on hand as well. Then there is PM, and preventative shutdowns, where things are removed and rebuilt, to keep the machine running. Things, such as bearing housings in the large weldments, if they're worn out, are welded up, on site, and bored out by portable boring mills, where new bearings are then installed. Everything is designed to be repairable, especially on these multi-million dollar machines.