Stump Jumper Keeps coming loose

Discuss your favorite brand and how to fix it.
hurleyjd
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Re: Stump Jumper Keeps coming loose

Post by hurleyjd » Fri Jul 12, 2019 12:40 pm

hurleyjd wrote:
Fri Jul 12, 2019 12:31 pm
Bright Raven wrote:
Fri Jul 12, 2019 10:35 am
alisonb wrote:
Fri Jul 12, 2019 10:30 am
Throw that nut away, it may have slack on it, try a new one...with a high tensile cotter pin/bolt. Make sure the thread is not stripped too. Is the rotary running smoothly or is there a vibration...seems like its picking up stress somewhere.
I am ahead of you. :P. I just put that new castle nut on Wednesday. It was $25. :o. Bushhog brand. The threads are perfect. I am on my way now to Fastenall to find a high tensile cotter pin.
Did you check to see if there was a large washer to make the nut really tight. Nut might be bottoming out and not keeping the blade carrier tight.
Washer part number from bush hog is 70900



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Re: Stump Jumper Keeps coming loose

Post by bball » Fri Jul 12, 2019 12:41 pm

Image

Item 8 is what hurley is referencing. Still got it?
If so, GB is correct i suspect. Either weld it or replace the worn parts.
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Re: Stump Jumper Keeps coming loose

Post by greybeard » Fri Jul 12, 2019 12:48 pm

hurleyjd wrote:
Fri Jul 12, 2019 12:31 pm
Bright Raven wrote:
Fri Jul 12, 2019 10:35 am
alisonb wrote:
Fri Jul 12, 2019 10:30 am
Throw that nut away, it may have slack on it, try a new one...with a high tensile cotter pin/bolt. Make sure the thread is not stripped too. Is the rotary running smoothly or is there a vibration...seems like its picking up stress somewhere.
I am ahead of you. :P. I just put that new castle nut on Wednesday. It was $25. :o. Bushhog brand. The threads are perfect. I am on my way now to Fastenall to find a high tensile cotter pin.
Did you check to see if there was a large washer to make the nut really tight. Nut might be bottoming out and not keeping the blade carrier tight.
That was the fix that was reccomended to BR last time or first time it happened.
The washer has to have a bigger ID than the end shoulder on the shaft tho iow, Just a tad bigger than the OD of the spline at bottom of the shaft. That will push the stump jumper hub farther up onto the shaft, providing the splines have not worn so badly that the top of the hub bottoms out on the shoulder that is on the top of the shaft.


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Re: Stump Jumper Keeps coming loose

Post by Bright Raven » Fri Jul 12, 2019 1:04 pm

bball wrote:
Fri Jul 12, 2019 12:41 pm
Image

Item 8 is what hurley is referencing. Still got it?
If so, GB is correct i suspect. Either weld it or replace the worn parts.
That is exactly it. I ordered it with the castle nut. I think the stump jumper (blade carrier) has worn splines. It probably needs a thicker washer. But now I got it back together. With the grade 8 bolt. If this fails, I am welding the dang thing.
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Re: Stump Jumper Keeps coming loose

Post by Bright Raven » Fri Jul 12, 2019 1:09 pm

greybeard wrote:
Fri Jul 12, 2019 12:48 pm
hurleyjd wrote:
Fri Jul 12, 2019 12:31 pm
Bright Raven wrote:
Fri Jul 12, 2019 10:35 am


I am ahead of you. :P. I just put that new castle nut on Wednesday. It was $25. :o. Bushhog brand. The threads are perfect. I am on my way now to Fastenall to find a high tensile cotter pin.
Did you check to see if there was a large washer to make the nut really tight. Nut might be bottoming out and not keeping the blade carrier tight.
That was the fix that was reccomended to BR last time or first time it happened.
The washer has to have a bigger ID than the end shoulder on the shaft tho iow, Just a tad bigger than the OD of the spline at bottom of the shaft. That will push the stump jumper hub farther up onto the shaft, providing the splines have not worn so badly that the top of the hub bottoms out on the shoulder that is on the top of the shaft.


viewtopic.php?p=1511279#p1511279
I remember that. You are correct.
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Re: Stump Jumper Keeps coming loose

Post by Aaron » Fri Jul 12, 2019 1:56 pm

I would toss the regular washer and put a Nordlock washer instead. Replace pin with bolt. If it goes again, weld it all up until she blows up because the bigger parts are likely worth more than the machine.
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Re: Stump Jumper Keeps coming loose

Post by skyhightree1 » Fri Jul 12, 2019 2:04 pm

Bright Raven wrote:
Fri Jul 12, 2019 9:40 am
Bushhog 296 Single Spindle Rotary Cutter. Single stump jumper with the usual two blades. The stump jumper is attached to the splines of the gearbox shaft with a washer and castle nut. There is a cotter key through the turrets of the castle nut.

The nut keeps coming loose and shears the cotter key. I have had the stump jumper drop off twice. It is not fun putting it back on. I just checked it after mowing this morning and it is loose again. What is a solution short of welding the dang thing on?
did you try putting 2 bolts and a lock washer somehow on it.
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Re: Stump Jumper Keeps coming loose

Post by True Grit Farms » Fri Jul 12, 2019 2:43 pm

Just tag weld one side of the nut, easy cheap and bullet proof. Over thinking things causes nothing but trouble.
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Re: Stump Jumper Keeps coming loose

Post by TennesseeTuxedo » Fri Jul 12, 2019 2:50 pm

greybeard wrote:
Fri Jul 12, 2019 12:19 pm
TennesseeTuxedo wrote:
Fri Jul 12, 2019 11:14 am
I told you a week ago you couldn’t fix that.
I've fixed more than one including the 6' Modern I have and several that came in to the Kubota dealership I worked for...there were also some that couldn't be fixed short of parts replacement , depending how long they ran with the nut loose, how many times it happened and how bad the splines were worn.
We had one, covered by Rhino warranty even tho it was out of warranty because it was bad metallurgy..they did a bad heat treat when they built the shaft for the gearbox.
I'm not saying IT could not be fixed GB, I'm saying HE could not fix it.
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Re: Stump Jumper Keeps coming loose

Post by BobbyLummus1 » Fri Jul 12, 2019 3:21 pm

i just went this turned out my output shaft that goes tthrough the carrier bearing was bent

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Re: Stump Jumper Keeps coming loose

Post by hurleyjd » Fri Jul 12, 2019 5:28 pm

order this kit and put on the shaft after a good cleaning of the shaft and the inside hub of the stump jumper and bolt it up and let it cure and it should last a while. There are a lot of you tube videos showing its use.


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Re: Stump Jumper Keeps coming loose

Post by sstterry » Fri Jul 12, 2019 10:32 pm

This has nothing to do with BR's problem, but I want to say that last year when I was having a problem with a large PTO shaft, hurleyjd's answer was the one that finally solved my problem, and I failed to say thank you.

So, if you will allow me to highjack the thread, thank you hurleyjd!

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Re: Stump Jumper Keeps coming loose

Post by TennesseeTuxedo » Sat Jul 13, 2019 6:18 am

On behalf of Mr. Hurley I’ll say you’re welcome. It really is a good tip.
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Re: Stump Jumper Keeps coming loose

Post by Bright Raven » Sat Jul 13, 2019 7:01 am

Thanks for all the comments, except that pesky penguin.

I think I am going to fit another washer on. Get it real tight. Then put the bolt through. They way it has no play. To loosen, it has to shear the bolt. The splines on the shaft are still perfect. The splines in the hub of the stump jumper are worn but still good..
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Re: Stump Jumper Keeps coming loose

Post by Lucky » Sat Jul 13, 2019 8:56 am

Had the same problem on my 3615 BushHog flexwing. The center stump jumper was loose every time I checked it no matter how tight I had gotten the nut the time before. A new stump jumper finally fixed it. They are pricey but not near as pricey as a new stump jumper and a new gearbox spindle.

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