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Cotter pins in M670 Super ampli-torque..lucky me.

A

Alan K

Well-known Member
Was going to adjust the ampli-torque on my M670 Super and noticed 3 of the cotter pins were nearly gone. With a little luck working through the adjusting plug hole, an O ring pick, and a screw driver or two I was able to change the 3 bad ones before anything else came apart. Glad I spotted them in time.
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I usually don't have a lot of patience on something like that either, but it went well lol. All that was left of the originals (pictured) were the top loop and just enough to go through the pin.
 
That thought crossed my mind. The last one was the worst to get out, of course. It only takes an unexpected slip to drop one.
 

Yupp, that is why I'd have just split the tractor rather then waste time trying from the one inch hole just to have to split it anyhow! Lol
 
We found some cotter pins like that in our U302 after the pins came out and all the bigger parts fell down and went under the big gears and broke a hole in the rear end case. That was in 1970-71 right about 2 months after the Dealer- Mechanic repaired the Ampli-torque and the tractor was 3-4 years old. Now how did they wear out that fast???
My Dad always thought they re-used the old bent up ones and never had any more work done there.

It took all summer to tear all the parts out of the Differential case so my Dad could turn it upside down and weld the hole up with Nickel stick welder. We even had to buy another tractor to use while it was down. It was reinforced with another 1/2" steel plate and tie bolts.

The repair was a success and hasn't broke or leaked oil as of this date. I suspose if that happened now there are plenty of tractors in junk yards we could find a new case. Not so easy in 1971.Cleddy
 
Not trying to be abrasive but in defense of the mechanic that rebuilt the ampli-torc, A-T parts can't get to the bull gears in the rear end. it is a separte case. They would have to pass through a timken bearing to get to the rear. The parts that damaged the rear end had to be PTO parts.
MMDEL
 
You most likely are right. I have forgot what the nature of the repairs were and it may have been for the PTO clutch. All I remember is hauling the tractor about 50 miles on a 1950 Chevy 2-ton Truck(6-cylinder)up and down the hills which was a trip for a kid.

I was using the tractor the day the Differential case broke and got off and looked and thought what did I do now??? When a kid is 17-18 years old there is just a black cloud that hangs over your head. We found parts and worn out cotter-pins and no other explanation so just fixed it and moved on. On three Minnieapolis-Moline tractors nothing like that ever happened again. CLeddy.
 
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