Broken Whip Mower

Had an accident that bent the square bar that drives the mower blade. Does anyone know how the joint comes apart in pic 2? I do not see any threads but I imagine it is threaded. I am not sure of the manufacture, previous owner painted everything. If anyone can help I would appreciate it. Edited pic two to show where I believe it is threaded. Thanks

Sparky 70,

This "Joint" should be a slip joint and the remainder of the square shaft should pull out once you get the twisted shaft started out of the end slightly. Check the shaft for being square or about 1/8 inch more in one dimension? They will have one dimension a little larger and cannot/should not go together but one way. This keeps the universal joints aligned. Be careful to repair the shaft in the correct alignment.

Well that helps a ton. I only very quickly put a tape on it so it appeared 1 inch sq. I will put a mic on it tomorrow. If it is indeed larger in one demension I assume that is a special order, or are they common items? Thanks for responding.

(quoted from post at 02:51:39 07/01/14) Sparky 70,

This "Joint" should be a slip joint and the remainder of the square shaft should pull out once you get the twisted shaft started out of the end slightly. Check the shaft for being square or about 1/8 inch more in one dimension? They will have one dimension a little larger and cannot/should not go together but one way. This keeps the universal joints aligned. Be careful to repair the shaft in the correct alignment.

Click to expand...

That doesn't come off. A PTO shaft is two parts. One is the
square shaft with a U joint. The other is a high quality piece of
pipe with a 8 inch piece welded on the end (that piece you
show) that has a square hole in the middle. If you could see
inside the round shaft you would see that it is just a piece of
pipe with a yoke on the other end.

If that round piece is bad you need to buy new. Get ready - PTO shaft pieces are pricey. If it took enough torque to twist the square shaft I would say both pieces need to be replaced.

Check salvage yards---probably cheaper.

Nope, no threads on a PTO shaft. It will either be welded to something or slips on something and is held by a clip.

If you wanged it that hard, you probably didn't do the U-joints any good either. Easiest thing to do is replace the whole shaft, joints and all.

Tractor Supply has an assortment of PTO shaft parts and PTO shafts, but you may need to visit 2-3 stores because they rarely keep more than one of any given PTO part in stock, and if that one is sold it won't be restocked until a truckload of supplies are needed.

Thanks to all for replying. Drs appt today, I will look at it again tomorrow. The ujoint to the pto and the other portion of the bar are in my vice. I was ready to grind the welds and prepare for replacing the bar, but now I guess there is another route. Hopefully I will make some progress tomorrow. We do have a tractor supply not too far away, more later and thanks again.

(quoted from post at 08:33:55 07/01/14)

If you wanged it that hard, you probably didn't do the U-joints any good either. Easiest thing to do is replace the whole shaft, joints and all.
.

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Why didn't the shear pin break...........

I have broke a few pins, but that's what they are there for,

No pins, the mower has a slip clutch. Never had any problem before with the slip clutch, but then again I never made such a blunder as this either.


Why didn't the shear pin break...........

I have broke a few pins, but that's what they are there for,[/quote]

Well the bar is 1 and .125 one side and 1 inch other. The broken piece slipped out with a little help. I seen what appeared to be replacement bars at tractor supply so I am off to see them in a day or two. Evidently different whip mower manufactures assembled pto shafts as they seen fit. Thanks to all that contributed, I am better informed.

This "Joint" should be a slip joint and the remainder of the square shaft should pull out once you get the twisted shaft started out of the end slightly. Check the shaft for being square or about 1/8 inch more in one dimension? They will have one dimension a little larger and cannot/should not go together but one way. This keeps the universal joints aligned. Be careful to repair the shaft in the correct alignment.[/quote]ttps://forumphotos.yesterdaystractors.com/photos/mvphoto8668.jpg[/img]

(quoted from post at 17:56:45 07/01/14) No pins, the mower has a slip clutch. Never had any problem before with the slip clutch, but then again I never made such a blunder as this either.

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/quote]

And no details on the blunder :wink: Glad you are getting everything back apart and hopefully back together. I don't totally trust slip clutches because they need adjustment sometimes. I venture to guess that the clutch may not have been involved in this though...............

(quoted from post at 08:33:55 07/01/14) ...Tractor Supply has an assortment of PTO shaft parts and PTO shafts, but you may need to visit 2-3 stores because they rarely keep more than one of any given PTO part in stock, and if that one is sold it won't be restocked until a truckload of supplies are needed.

Click to expand...

Why wouldn't you just use the interwebs and search their inventory or call them?