Check the wooden bearings and spools. They were completely worn out on mine. I couldn"t find replacement parts so I built new spools out of pipe and added a 1/2in thick thrust plate at the end of each one. I had a local woodworker turn some new bearings out of black locust wood. I also shortened the axles and removed the outside disc from each gang and made a 6 foot disc out of it. Been using it for about 20 years that way with no problem although it doesn"t get many hours of use each year.