3 point attaching pin hole wallowed out.

Jonnybronco · Jan 24, 2017

I just bought an Oliver Super 55, and the left side 3 point lift arm attaching pin hole is pretty wallowed out. It had been heli-coiled, but it stripped out again. Even with the heli-coil in the hole the pin would just slide in and out of the hole freely.

I pulled the heli-coil out and there is very little evidence of threads left in the hole. Has anyone ever tried drilling and bushing one of these? Is there an oversized pin that will fit.

Here is the pin just inserted in the hole.

Any ideas?

Thanks

Jonny

Bhunt · Jan 25, 2017

https://www.zoro.com/value-brand-hex-reducing-bushing-1-12-x-34-in-1rru7/i/G2423215/?

If you have enough wall thickness left on the tractor to drill the hole up and Rethread it Id try something like this if you need to use same size bolt. Id Get rid of that bolt you have now its a bad design for what you are trying to do it will continue to be part of the problem. Its difficult to tell from the pic just how long the bushing would need to be The ideal length would extend as close to the bottom of the hole as you can get it. I would also bond it or seal it in there as well because of the dissimilar metals involved it will start to corrode the hole on the tractor quicker. If the hex head is an issue you may be able to get one long enough you can grind it off after Installing. My guess is you don't want to install another helicoil because of the elongated hole. Also my personal opinion installing a smooth walled bushing with a counter bore like the original hole had will likely fail because of the load on it. Of course the choice is yours
Best of luck with it Byron

Bhunt · Jan 25, 2017

This may be something you would be better off taking to a machine shop that would have access to a flat bottom drill and a drill block to clean up that hole with a minimum of material removed. weather you use an oversized bolt or a threaded bushing Your probably going to get just one chance here.
Byron

glennster · Jan 25, 2017

didnt see any replys yet so i'll take a stab. it looks like there is a lot of metal there to work with. i would see if you can have a local machine shop make you an oversize pin then drill the housing out to the next bigger size. they may have some other ideas too. possibly a threaded sleeve insert type repair.

glennster · Jan 25, 2017

whoops, byron got in there while i was dawdling with a reply.

craigco · Jan 25, 2017

I had oversize pins made for my 3010
JD. Took the cradle and arms to a
machine shop. Made new pins to fit the
wear in the arms and drilled out the
cradle. He gave me a lifetime
replacement for pins if they start to
wear, to eliminate the need to re drill
the cradle again.

Mike(NEOhio) · Jan 25, 2017

Helicoils are good for keeping bolts tight but not for side thrust like this application. The coils will squirm and allow the pin to lean. Two helicoils in line would have been better. Your best option would be to make a good threaded insert from something like SAE 4140.

Mike M · Jan 25, 2017

I'd post this at the oliver board. Surly yours can't be the only one that ever had this problem.

Jonnybronco · Jan 25, 2017

Thanks for all the advise. I have a friend who works at a machine shop, I will see if he can take a look at it. I will also post on the Oliver board to see if anyone else has had a similar problem.

I agree that I don't want to go the heli-coil route again. I have looked at some bushings, but none of them seem long enough.

Is the tapered fitting not common for this type of application? It makes sense to me. As long as the bolt stays tight it leaves no room for movement, like a tie rod end. I actually have a tapered reamer for tie rod ends, but the taper is much steeper and it isn't a large enough diameter.

Jonny

3 point attaching pin hole wallowed out.

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