Welding PTO shaft

37chief · Mar 19, 2012

I need to repalce the square drive end on my PTO shaft, I cut off the old end. The new end is a tight fit into the PTO tube. Now I need to weld it. How should I go about welding the end back on,to keep it from warping. Should I just start and weld around the tube, or weld a small spot, the go to the opposite side? Stan

ohiojim · Mar 19, 2012

i'm no expert but i've never welded anything like that that stayed straight,..i think the factory straightens after welding,..but my best guess would be to tack it all around then weld it up..

Tx Jim · Mar 19, 2012

(quoted from post at 10:14:33 03/19/12) I need to repalce the square drive end on my PTO shaft, I cut off the old end. The new end is a tight fit into the PTO tube. Now I need to weld it. How should I go about welding the end back on,to keep it from warping. Should I just start and weld around the tube, or weld a small spot, the go to the opposite side? Stan

I'd set it up straight with the corresponding u-joint in "TIME OR PHASE" and weld it.

JOHNNYfromMI · Mar 19, 2012

Make sure you time it with the other joint. In phase of oppisite.

IBorange in TX · Mar 19, 2012

If you are welding to the yoke, you need to grind the old weld that is on the yoke and hopefully be able to drive the old chunk out of the yoke. Then insert the new square stock and weld on the inside of the yoke,not on the outside. By doing so, you are letting the yoke do its job of holdiing the sq. stock. Do not weld on the outside of the yoke where the sq stock goes into the yoke. If you do, the weld is doing all of the work and it will break at that point when put under stress.

Hope this helps, have done this procedure several times. Had to learn the hard way.
Good luck

donjr · Mar 19, 2012

The shaft and joint should be 'off' sized- like 1 X1 1/8. You may have to heat the joint for it to fit over the shaft, then let it cool. Set the end of the shaft even with the back of the cross area. Then weld around the collar area. If for some reason you mess this shaft up, the joint can be cut off easily and replaced without having to buy a new shaft.

Walt Davies · Mar 19, 2012

The shaft should have one end that it turned down to fit into the hole in the Yoke then weld in place. Check to see if the yoke has a hole in the end where the shaft has been inserted.
Walt

jm. · Mar 19, 2012

I guess I am lucky because I have done it many times and heve had a problem. Most of the newer ones are football shaped or three corner but I just clean up the shavt and get it to fit the yoke as good as possible and go to welding. Not enought heat there to cause any problem. After all it only turns 540 or 1000 many running bent and worn. Not rocket sicence to fix a shaft. I keep the sticks of stock shaft in the shop for repair all time. More problem now finding out what you have so many metrice and diffrent shafts.

Welding PTO shaft

37chief

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ohiojim

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Tx Jim

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JOHNNYfromMI

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IBorange in TX

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donjr

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Walt Davies

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jm.

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