Stop Brush Hog Vibration~Part 1

[@kevinashby3784]

I know you don’t really want a bunch of backseat mechanics but think about this. Multiply the weight you applied to you cheater pipe by distance from the nut to where you were exerting force, and that’s the amount of torque applied. If you were pushing with 100 lbs force and the bar is 8’ from the nut, that’s 800 ft-lb of torque. The OEM has a limit to the about torque that should be applied. Thus, a longer cheater pipe is not always the answer.

[@rickymeadows5176]

I have a Kubota too and this must be an issue w/Kubotas and bush hawgs... i have found that unless the mower is plumb and level w/ground with wheel supporting back end, front to back and side to side , it is going to buck like a bronc...Another thing might be to make sure after sharpening , that both blades weigh the same before reinstall if not take a little more off heavy blade till they about match in weight.. Thanks for the vid.

[@robertgeorge5677]

It takes about 10 min. to remove the blades. Check for wear on the blade holding bolts and the hole in the blades. Do keep in mind these blades must be within 5lbs f each other because this is a balanced system. If you ever look at a skid plate, stump jumper or what ever you want to call it you will see that it is a balanced piece of hardware. Something out of balance is what you are looking for.

[@codeboyx]

I have a king cutter. A 6 inch piece of 14 gauge hog wire wrapped around the head of the blade bolt. It vibrated the hole tractor. Not just the mower. Half an ounce can make it vibrate.

[@phiksit]

I would think since the blade / pan assembly was loose, it would be a good time to remove and inspect it. I was just welding up a cracked pan on one of these and the top side of the pan was awfully pitted / corroded and warped. I think this stump jumper forgot to jump a few too many times :)

[@blight819]

Might try a washer under the castle nut and go with factory torque specs. There is a reason you should stick to factory specific torque values. ...So you can get it to back off without damage the equipment. I've been a mechanic for over 40 years and seen the effects of people over torquing a component, it fails... when it does, it usually costs money or skin, or worse--both. This is why crush washers allow minimal torque and allow fasteners, drain bolts, and other components to be removed easily from equipment.

[@BIGALTX]

Yep... I think I learned my lesson. Had to put it in the dealer's shop... Part 2 (documenting the results) will be posted soon.

[@bigearl1414]

Grandson hit the post button. Sorry. The splined part of your stump jumper is above the splines on your gear box shaft, make a washer with a large center hole big enough to go over the splines on the gear box shaft. This will push the stump jumper up on the splines and tighten them. worked for me.

[@snakerstran9101]

Looked like a possibility that the nut was bottoming against the shoulder of the shaft before tightening against the stack of washers, etc. Also most of the 3pt brush hogs are meant to be tipped by lifting the rear and resting on the front. Just keep the PTO shaft out of the way.

[@1timby]

Hope you had a very Merry Christmas and a Happy New Year. Stay warm

[@codeboyx]

It's called a Pan Weldment (stump jumper) by brush hog parts catalog. Never use a cheater to tighten the nut on the bottom of the shaft. Only to loosen. Remove the nut to inspect the spacing under the nut.Then remove the stump jumper & check the splines for debree,damage or bad bearing. If it wont tighten with just a ratchet or wrench and lub. On our king cutter the stump jumper splines striped out. Dad tried to tighten it with a 5 foot cheater after using just a 3/4 ratchet because it was still loose.. Needles to say he striped the threads of the shaft. So we had to buy a bottom shaft & stump jumper.

[@BIGALTX]

Ouch...

[@darrenpickens7147]

I think the reason the castle nut broke was because you were TIGHTENING IT.................TURNING IT THE WRONG WAY!!!! I'm pretty sure the nut has right hand threads.

[@semco72057]

I would hate to see the day when I have to fix my bush hog and have been looking for the proper tools to work on the unit with. That must have been a long job repairing that bush hog you have and I hope all worked out fine for you.

[@lydck1]

This may have already be said but the bad thing about greasing something that is not sealed in an environment like that is the grease will hold dirt and grit and act as a grinding wheel and wear pins, blades, jumpers and pins in an accelerated pace!. Just a thought!! :)

[@loquat4440]

That was my thought.

[@carlosrobles9148]

What would it act like if there's no grease at all? I'd say worse.

[@jeffgove691]

If it was meant to have grease it would have a fitting to pump it into

[@ox6942]

Use graphite.

[@Hound427]

Just gonna say that, like the old wheel bearings, you never want to get them too tight. It’ll just lead to premature bearing failure and not let the bearing grease do it’s job.

[@BIGALTX]

Thanks for the tip!

[@brandoncaldwell95]

I bought a 12ft shredder new from the dealer. Guess they didnt bother putting the tow pin in with the safty pin. They also put the safty shield antispin chain to that pin. First 1000 ft and it popped right out! New shredder smashing to the ground! Ever since then, been having a vibration on the right wing. Its smooth when mowing but vibrates when nothings going in.

[@BIGALTX]

Smooth when running, but vibrates when disengaged... wow, that's more confusing than mine.

[@brandoncaldwell95]

@@BIGALTX i must have worded it incorrectly. On first startup its ok and smooth. At full rpm its shakes on the right wing. The right wing pto shaft does have a slight bounce/bow to it. This shake happens when not enough "load" is on the machine. If being pulled through thick brush or grass its smooth and everything acts correctly. This all happened after falling off the pin in the first 1000ft of being used after delivery. I partially take blame for not checking the attachment after being delivered to my property. I do blame the dealer guys for having the PTO shield antispin chain being hooked to the pull pin which caused the pin to remove itself and the shredder to fall off the tow bar

[@BIGALTX]

@@brandoncaldwell95 That's kinda like what mine is doing. Vibration goes down in tall grass.

[@brandoncaldwell95]

@@BIGALTX after 3 weeks, phone call to the dealer and a service tech to double check the unit (still waiting for his arrival) I might suggest checking all the bolts to the structure and especially to the gearbox mount and U joints. I was out cutting again today after talking to my dealer. He believes its the blades being unbalanced or the PTO shafts are bent, however I found multiple bolts to all be loose on my 12ft batwing. Especially the 3 gear boxes. Freaked me out after realizing maybe 200lbs of steel, stump jumper and blades at 16,000 RPM could have completely detonated behind me. My 6fter has imbalanced blades and the 3 point structure is also loose causing the vibration to look worse than it really is. Doesnt help i was cutting 3-5in brush with both of them.

[@ClickinChicken]

I have experience with this. Just tighten them straight, that's what I do. Mills Fleet Farm. One blade goes crooked. Terrible vibration.

[@notsheeple2019]

when sharpening the blades make sure they are same weight and equally balanced. don't ask how I know this reason for vibration.

[@BIGALTX]

Yep.. the dealer said a 2oz difference will make it vibrate... crazy !

[@countryboycharlie9793]

Is a clean brake shiny,or is part of it rusty like in the crank of the castle nut, it might already been half cracked already we’re the vibration was come from.just a guess, good luck 👍

[@rgriffith2006]

Castle nut was fine. That play was in your bearings. Every nut on pieces of equipment like that will have a torque spec published somewhere. Gotta look that up be fore ya.......you know......plunge ahead with reckless confidence.....so to speak. :)

[@BIGALTX]

"Reckless Confidence" I've got to remember that term... it pretty much describes my life! 😊

[@rgriffith2006]

@@BIGALTX Its from the bible quote at the beginning of your video. I resolved my own bush hog vibration issue, btw. Land Pride put one of the blades on upside down. Must've been someone's first day.

[@tater357]

Ummm...If you broke the CastleNut, I'd be willing to bet that it was TIGHT enough. lol.

[@loquat4440]

I would guess that the castle nut was already partially cracked. I wonder if there is a taper to the nut or bolt? Taking a nut off should not crack it. You might break the bolt or strip the edges off the nut, but crack it I think not.

[@Jake-cz1kb]

@@loquat4440 He cracked it by tightening it more, I dont think it was loose. He put an 8' cheater bar on it and wondered why it broke.

[@loquat4440]

@@Jake-cz1kb Are they reversed threaded. I know on a mower I make sure I know which way to turn the nut

[@Jake-cz1kb]

@@loquat4440 Ah, sorry. Both of my mowers are righty tighty.

[@davidpeters7521]

wish you a lot of luck! I really like your vids especially on black berries. do yo know where Bernard has got to. I have missed him for the last 3 or 4 months?

[@BIGALTX]

Thanks for the kind words. No, I don't know anything about Bernard... sorry.

[@robertgeorge5677]

Don't you people ever look at a IPL (illustrated parts list) or visual breakdown of the product you are trying to work on to see how it is constructed.

[@bigearl1414]

I had the same problem on 2 of my bushhogs, the splined portion of your stump jumper is below the splines on

[@brewerpop]

I've got a brush hog/chopper that vibrates but when I check the blades I discovered that they are fixed; they don't rotate as they should. Would you guess that some sort of lubricant might break them free? Any suggestions are appreciated. Thanks!

[@BIGALTX]

I don't know your specific mower, but if they are supposed to swing.. then yes, that might be the problem.

[@damienbull8160]

Too close to the tires in the back! You need to get adapter for this or get a new one that fits this tractor! 👍

[@dlmarkum]

if your blades are worn and one more so than the other can cause vibrations

[@BIGALTX]

Absolutely... the dealer told me that a 2 OUNCE DIFFERENCE can cause vibration. Wow...

[@OzarklivingHomestead]

was that a reverse threaded nut? Or where you tighting it instead loosening it?

[@BIGALTX]

I was trying to tighten it up. The stump jumper (the plate) was loose and causing the vibration.

[@OzarklivingHomestead]

sorry I should pay more attention I thought you were trying to remove it.

[@Mate2Frio]

Might should have tried it after getting the blades free to see if that was the issue.

[@BIGALTX]

I did... follow-up video soon

[@aleksandarsejic3459]

What is dimension of the blades ?

[@BIGALTX]

This is a 6 foot brush hog. Not sure exactly how long the blades are but somewhere around 2 feet long. They are attached to a “stump jumper“ which is about 2 feet in diameter.

[@leedawson8301]

Ummm....no to the grease in this situation! The grease will collect dust, making it in to a very gritty sanding or grinding type surface. If you must use a lubricant use WD 40 to free it up.

[@BIGALTX]

👍 thanks

[@silentwayne5864]

is the gearbox full? may be a bearing? or could be wear in the splines.

[@BIGALTX]

Gearbox was actually over-full

[@marchill5628]

They make a spray grease. Sold at Napa.

[@BIGALTX]

I need to get me some.

[@marchill5628]

I work at Napa. If u can't find at you're local store. E mail me.

[@chrisspence3216]

Umm take blade off to grease ? And add anti seize to all parts on these things

[@oby-1607]

How do pins get frozen in Texas?

[@MrGSF77]

So my lazy conclusion would be.., let it vibrate? (lol)

[@Mr.frag-out]

Must be balanced to within 1-2 oz danielson

[@chrisspence3216]

Um it’s tight , if moving is maybe seal or gear box mounts

[@MAINEiacGrammiesHomestead]

Mine vibrates too....

[@pswank68]

I figured you were going to break something. first I would have removed blades and weighed them to make sure they were balanced. Now that the nut is broken I recommend you disassemble, clean, inspect, lube, and reassemble the whole drive assembly. there isnt much there.

[@BIGALTX]

Way ahead of ya. It's in the shop right now... lots of problems. Part 2 is coming soon and will discuss what they found.

[@thomparr2217]

Uhhmmm This is a old video, but lefty loosely. You broke it because you were tightening it.

[@BIGALTX]

I was trying to tighten it. The stump jumper was loose and causing it to vibrate

[@MegaBolens]

There is no z in grease

[@BIGALTX]

Uhhhhh... sure

[@renafurman1890]

C