Have a 69 Ford 3000 3-cyl gas tractor that keeps eating the starter drive. I replaced the starter motor a couple years ago shortly after buying the tractor. About 6 months back, starter trouble resurfaced. The starter motor spins, the solenoid appears to pull in, but he engine doesn"t turn over. Replaced the drive and worked great - for about two months. Had a mechanic look at it and he was stumped. He has worked on the tractor before (put in a new clutch). He put in a new drive and I worked fine. One month later, the drive is out again.