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Harry Ferguson Tractors Discussion Forum
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PTO vibration

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RonL

07-04-2006 06:16:36




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Hello all.
Wonder if someone might have a clue on my bush hog drive shaft vibration I am getting. A while ago I got a front wheel stuck in a down hill corner in soft turf. Tried to back up without thinking the bush hog was still down. After I raised the mower, I backed out ok. Now I have developed a vibration (severe) it seems in the front joint of the driveshaft but only if I start to back up. Runs fine when going forward. It will stop imeaditatly if I disengage the pto with the lever. The vib is really bad and sounds like it might destroy the shaft if I don't stop it right away. Sorry for the long post, but would like to get an idea.

Thanks again guys, and really enjoy this forum.

Ron, in upstate New York.

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John (UK)

07-04-2006 13:08:12




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 Re: PTO vibration in reply to RonL, 07-04-2006 06:16:36  
Any vibrations will be due to something in the drive-line (PTO) being bent or damaged. Check the Universal joint right at the back of the tractor, is it "wobbling" and not running true, if it is you may have bent the PTO on the tractor. Another usual thing is that you have damaged the blade or blades on the mower. If it damages one of the blades or just one end if it is a single blade then it will be out of balance, like a wheel on your car. It needs to be replaced or rebalanced. The blades on these mowers should be kept sharp so it will be easier to drive. Just re-read your post again and saw about it being ok if you drive forward, I would check the PTO shaft on the mower to see if both halves will telescope easily into each other, it may be that the shaft has a twist in it from the shock of you dropping in that hole and the mower stopping suddenly

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Jerry/MT

07-04-2006 11:35:19




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 Re: PTO vibration in reply to RonL, 07-04-2006 06:16:36  
Check the three point attachment on the mower and the sway braces that go between the rear axle and mower. You might have bent something. When you are moving forward, the "drag" forces on the tractor tend to make it kind of strighten out. When you back up the trailing wheel makesit want to "wander" and if the 3 pt frme is bent, it maybe causing an odd angle in the drive line.

You didn't say what tractor you have and it's irrelevant to your stated problem, but if it's a TE-20,TO-20 or TO-30 are you using, you should have an ORC between the tractor PTO shaft and the mower drive shaft for safety reasons. The pto on these tractors is transmission driven and even stepping on the clutch does not disconnect the mower from the transmission. The rotating inertia of the mower will continue to drive the tractor even when disconnecting the engine from the driveline with the clutch, thus driving you into a ditch, or tree, etc.

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RonL

07-04-2006 18:26:10




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 Re: PTO vibration in reply to Jerry/MT, 07-04-2006 11:35:19  
Thanks so much for the replys John and Jerry. The tractor is a TO30, and yes Jerry I do have an ORC on the pto. Just a little more detail, when I was stuck in soft soil with the front and tried to back up, I wasnt using the noggin and didnt notice right away I had the tail wheel on the bush hog turned 90 degrees, sideways. That put a lot of pressure on the hitch when I was trying to back up. Too much I guess. I have not noticed yet anything obvious, or bent, but will take yours and Johns advice and take a good look at it. Really hope I didn't do any damage to the pto system. Sounds like it could be expensive. Just on a different note, I put all new 1 gauge battery and starter cables on it this week and sure starts a lot better. Got to get that darn voltage reg. tweeked up now. Anyway, thanks to both of you and will dig into it soon and get back to you for a report.

Thanks again, Ron

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