Tension. I've got a tight needle tension problem and the tension adjustment seems to make no

Question

I've got a tight needle tension problem and the tension adjustment seems to make no difference. I can sew ok as long as the dog feed is in a cooperative position but every now and then the cotton breaks. Hard to pull to cut threads. Presume the problem is mechanical, maybe I could adjust the s***w on the tension dial? Or does something need oiling?