Well Its broke I guess Im done for today

1939farmall · May 24, 2021

Ever had one of those days? I was 4 rounds in to brush cutting, the tractor started to stumble like it wasnt getting fuel, then I heard a pop looked back and saw this. I said a few things I cant repeat here. Ive never had a yolk break like that before. I wonder if the tractor bucking shocked the pto? The shaft is old I guess it could have been weak and finally let go. I dont know but Im quitting for today before I really screw something up.

fastfarmall · May 24, 2021

Well that's a fresh break,don't think a hic-cup would do that, you sure you didn't hit something ?

rrlund · May 24, 2021

That's how most of my days end.

1939farmall · May 24, 2021

No I know I didnt hit anything, but the mower has had some hard use over the years. My guess is it was weak.

jon f mn · May 24, 2021

Most of that is older break, you can see the color difference. My guess is you hit something and broke it some then it just gave up. The cough very well could have been the last straw so to speak.

steve_in_mo · May 24, 2021

I agree. There is no evidence of discoloration but I wonder what the original diameter of the hole was supposed to be and the original thickness of the walls on that yoke.

1939farmall · May 24, 2021

I went back to the scene of the crime and found the other half of the yolk laying right where it broke. It looks like it might have been cracked looking at this half. Might be hard to tell in this picture.

thehickdaddy · May 24, 2021

Welder up and finish the field.

used red MN · May 24, 2021

Must of had Tractor V playing with your smoke screw! ; > )

Russ from MN · May 24, 2021

Does the cutter have a slip clutch or a shear pin? If it has a slip clutch you should loosen the bolts and slip it once before starting cutting in the spring, and re-tighten it. Sitting over winter they will stick, especially if left outside.

flying belgian · May 24, 2021

This might be a good time to repeat my wife's saying,,,did anyone get hurt? No. Then fix it up and get going.

fixerupper · May 24, 2021

By my uneducated eye about three fourths of the break is discolored in the first picture. Very little of the break is clean looking. I vote for the previous fatigue idea.

1939farmall · May 24, 2021

Id say that sums it up well.

1939farmall · May 24, 2021

It has a shear pin. I thought thats what broke when I first heard the pop.

RogerinIowa · May 24, 2021

Notice the brinelling on the exposed ends of the cross. They are the groves worn in the cross by the needle bearings. It may have contributed to the failute as the needles can't roll. It is a normal failure mode from wear.
You could check before a failure by trying to turn by hand in tbe direction of normal rotation and moving the free yoke. If you feel any brinelling, replace the cross assembly.

Gtidwell · May 24, 2021

X2 sir

1939farmall · May 24, 2021

I think your on the money. My dad and I have used this mower for 15 or 20 years now and we have both hit things with it in the past. I think it was fatigued and today was the day it finally broke.

2late4me · May 24, 2021

Well now you know what the limit is, Back off the smoke screw half turn and you will be fine. Hard to keep light equipment healthy when your running it behind extreme horsepower like you have there. :>)

1939farmall · May 24, 2021

LOL Ill have to remember to keep the old super H at half throttle from now on.

T.R.K. · May 24, 2021

That universal at the tractor pto is somewhat of a weak point on those tow-behind cutters.

bc · May 24, 2021

(quoted from post at 19:02:46 05/24/21) Notice the brinelling on the exposed ends of the cross. They are the groves worn in the cross by the needle bearings. It may have contributed to the failute as the needles can't roll. It is a normal failure mode from wear.
You could check before a failure by trying to turn by hand in tbe direction of normal rotation and moving the free yoke. If you feel any brinelling, replace the cross assembly.

Not sure what you mean by the word brinelling. How would that feel?

ss55 · May 25, 2021

Three joint PTO shafts handle short turns under power better than two joint shafts.

Roger in Iowa · May 25, 2021

Brinelling is where the needles wear into the cross leaving little grooves all in a line.

You can detect by twinsting the yoke in the direction of the normal drive load and rocking the yoke in two
directions causing the needles to try rolling, and that is what you feel. If you feel anything other than
smooth, replace the cross before it fails.

shinnery · Jun 2, 2021

looks like in addition to the yolk breaking the yoke broke in your driveshaft.

Eldon (WA) · Jun 2, 2021

(quoted from post at 13:33:24 05/24/21)
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto89520.jpg>

<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto89521.jpg>
Ever had one of those days? I was 4 rounds in to brush cutting, the tractor started to stumble like it wasnt getting fuel, then I heard a pop looked back and saw this. I said a few things I cant repeat here. Ive never had a yolk break like that before. I wonder if the tractor bucking shocked the pto? The shaft is old I guess it could have been weak and finally let go. I dont know but Im quitting for today before I really screw something up.

That is why I own two Bush Hogs.....nice to have a backup when doing custom work.

Well Its broke I guess Im done for today

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