Hy!
Guys!


I opened a 50ton Screw Compressor Hitachi, and the color of all internal pieces ( least the bearings) were with cupper colored!

Someone knows what happened?!?
The Compressor was never in maintanence in 5 years !

Someone knows if I will be able to remove this "layer" in all pieces ?

The gas is R22 with POE (sintetic ) Castrol Icematic SW220.

All informations are welcome!!

Dalmo