Why are Late A's /60's death on clutch drivers?

bigboreG

Member
Always!! I have 4 late A tractors, and two early styled ones. The early ones seem to be fine. But all 4 late ones have needed a driver. And one needed a flywheel. Also, the 60 I had took a driver once too. My G or 70 has never once had any trouble whatsoever . Thoughts on this topic?
 
More HP ? and also I don't think people can get them tight enough because the crank turns on them. Real early tractors with the castle nut there were even worse it seems.
 
We have a 50 A my grandfather bought new, and the clutch driver has never been a problem. The tractor has seen a lot of use, been through 2 power blocks, etc. Our G, however, has had clutch driver issues.
 
Im wondering if there is actually any true fix to this problem? I had a 60 here once that the driver was brazed to the crank end. Then upon further inspection, the flywheel had tin can shims in the splines. I had a reconditioned crank with another flywheel on the shelf, so I just swapped everything out and bought a new driver. That one turned out good.
 
Maybe the flywheel / driver on your grandads A was treated as a maintenance item? If so, this may have contributed to trouble free operation . Most folks never thought twice about them.
 
Not really... they only get attention unless needed. I think the G's were a much bigger problem. Try finding a good used G clutch driver.
 
Im quite sure a very late A and a G take the same driver. I'm talking mid 600s serial # range. I never buy them used. That's just a shot in the dark with one.
 
Back in the day when we were still using the G a lot in every day services, there were no new ones available. It's nice there are now, but I haven't needed one for some time.
 
My Dad made shims to put into the splines on his 70 lp, he once told me that if I ever took the flywheel off, not to lose the shims:) It's been 30 odd years since then, and I still haven't had to remove the flywheel. Those shims have been worth more than their weight in gold!
 
My 51 A had that problem. The splines got so I couldn't tighten the driver anymore so I shimmed it for awhile. A couple years later I welded up the splines and ground them back to close to specs by hand. Took the right rear wheel off so I had room, sat there on a stool and ground and measured for seemingly forever till I got it close to right. After I put it together there was a slight pulsing in the clutch lever for a year or so, then it smoothed out. I did this probably all of twenty years ago and it is still holding. Maybe I got lucky.
 

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