My Brush Hog is Shaking Like it's the End of the World

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I get a fair amount of questions about brush cutter vibration, as do service managers anywhere they're sold. The general situation is, a person has been brush hogging, they hit a big rock or log, there's a tremendous racket, they turn off the PTO and drive away from the obstruction. Then, they get ready to cut again, kick in their PTO and the cutter shakes violently. It's such a scary situation they'll usually turn off the tractor and run away, convinced they're completely destroyed something. Usually its a real easy fix.
What's happened is pretty simple. The blades pivot on big bolts, and one of them is nicely tucked under another one. It will literally make the cutter and tractor shake so badly that you may think the world has come to an end. All you have to do is get them separated, be prepared to use a good sized hammer.
The machine can also shake if the shaft that the blade pan attaches to gets wollered out. "Wollered" may be a word that only those of us of Appalachian descent folks what means. Basically if the splines get worn to the point that allows up and down movement of the blade pan, you're going to get a good vibration. The same can also happen when a U-joint on a PTO shaft gets worn out.
Regardless of what the source of vibration is on a brush hog, it's a sign of a problem and shouldn't be ignored. I've actually seen cracks in the welding on the top of the deck mainframe that were caused by continuing to run the machine after a vibration started. You don't want to get to that point.
Also in this video we discuss the stump jumper. That's a big disk that the blades spin from that helps guide the cutter over a stump if one is encountered in the field, versus hitting them straight on. If you're cutting big open fields with no possibility of finding hidden stumps, you don't need to worry whether the cutter has one or not. With me, going into the timber a lot, I need that stump jumper.
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Опубликовано:

29 авг 2018

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Комментарии : 33

@johhlocke1687 4 года назад

Thanks guys for the excellent information. You answered my question about the wobble within my bushhog going to tractor pto. The bearings are worn out and the reservoir was empty. Learn as you go.

@jacobzimmerman3330 4 года назад

Thanks Mike, this helped me troubleshoot my brush hog issue.

@comlbbeau 5 лет назад

I might add, and you've mentioned it, the gearbox mounting bolts should be checked for security as well in the event of vibration. Good points.

@johnbirman5840 4 года назад

Yep. Just started brush hogging for the year. Vibrating too much. Didn’t do anything different than end of season, checked blades, one a little gummed up with old weeds. Cleared It out, put a. Little grease. No vibration. Off we go. Thanks.

@larryhewitt1078 5 лет назад

Sometimes the gearbox’s bolts can come loose from the deck so always keep an eye on them and keep them tight!

@GPOutdoors 5 лет назад

Thanks Mike! Good video. Cheers!

@HeritageFarmsTexas 5 лет назад

Outstanding video. Good info

@JSanto-lw7gn 2 года назад

Thanks guys!

@BrucesShop 5 лет назад

Thanks Mike.

@junefields1512 2 года назад

Thanks for sharing

@jacobc5757 5 лет назад

Tractor Mike - You forgot that it may have lost a blade or broke a blade. Also, if the blades get a foreign object wrapped around them! This could cause a vibration! I had experience with a stray water hose that was left out in the barn yard and it was picked up by the blades in the tall grass. You have did previous videos I know. But still, a new tractor owner might not know!

@henrybarrow1 4 года назад

How about some information about fixing the gearbox and testing the u-joint ?

@damonr2233 10 месяцев назад

Curious to know how much up and down movement to expect where the blades meet the stump jumper

@lmfarms4611 3 года назад

grass builds up between the blade and bolt preventing the blades to spin, how do I prevent that from happening?

@csedan510 2 года назад

I did a weld repair on my stump jumper, I had cracks around the holes where the bolts hold the blades. I removed the blades, welded and ground them, then took 2 pieces of . 065 ( both 6"x6" square) punched a hole and welded those over the fixed area. On reassembly, I have a little wobble through the steering wheel. What's the best way to balance?

@toddbollinger7667 2 года назад

That made my day. " You about cut my head off" LMAO

@txtpqb 4 года назад

Can a PTO shaft between the tractor and gear box that has play in the slide cause a bad vibration too? Just wondering if mine is the blades are uneven and/or the shaft is too loose where they slide in and out of one another? thx

@ioe12 Год назад

Is there a certain way to time the two blades or gearboxes so they don't hit each other or cause a vibration

@loganyoutube4818 3 года назад

The castle nut pin can come out and the castle nut can back off and let the stump jumper wobble too

@cogreza 4 года назад

on my bush hog 160 the blades hitting each other like crazy, they started after a cut a mesquite tree around 2 1/2 in diameter

@brharrell Год назад

How much vibration is too much? I have a pretty good vibration that seems to mostly dissipate after getting cutter up to speed and while cutting. But it’s definitely noticeable when first starting. Any insights? Thanks, as always, for the helpful info!

@TractorMike 11 месяцев назад

That sounds normal. Things shake a bunch as the blade pan and blades get up to speed.

@phil-1115 2 года назад

I have an issue with my Brush Hog. It has less than 10 hours on it and it is new. I have a vibration issue. I checked the blades and they were not moving around freely. They seemed like they were too tight. I will find out this weekend if something is caught under the blades. I don't know yet though.

@martypapanek8858 2 года назад

My bush hog is scalloping (cutting lower on one side). Is this due to an inbalance?

@richardvaldez2181 Год назад

I have a 10 foot rotary cutter by Kodiak it’s borrowed the blades are interfering with each other, I am bolted one of the driveshaft and rotated it half but it still seems to line up should the two blades come together at all or is the blades that are on or too long?

@TractorMike Год назад

The blades should not contact each other. That'll make a heckuva racket when you engage the PTO. Sounds to me like the wrong blades.

@chevyon37s 5 лет назад

We’ve had a seal go bad on our old HX15, oil leaked out. Killed the lower output bearing but instead of a vibration it snapped the bolt holding the stump jumper on and the whole stump jumper and blades fell off. Luckily I shut it off quick, and with new bearings, seals, and a new bolt it was good to go.

@AP-xq3jm Год назад

My JD MX6 is wobbling bag. The pto clutch is Hitting the housing. I pulled the stump jumper and can't find much damage. Mayne the blades are damaged. I will buy new ones. Can the gearbox be replaced?

@TractorMike Год назад

Yeah, but they're pricey! When you figure labor and everything it doesn't take long to get a big chunk of the price of a new cutter in an old one. Maybe time to trade?