Bandsaw breaks blades

I have one of those Clarke horizontal bandsaws. I bought it about 15 years ago. I cut 3/16 wall 2x6 steel tubing with it. It started cutting crooked then it started breaking blades in just a couple minutes.So I pushed it aside and forgot about it.
So lately I need it again. I put all new bearings in it hoping that would fix it.
It did not. can anyone offer any suggestions?