TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Discussion Forum

Vibrating Flail Mower

Welcome Guest, Log in or Register

Author

Bob Semrau

03-22-2002 06:10:07

Report to Moderator

I recently bought a 5 foot Mott 3ph flail mower at a consignment auction for $100. It needed a new PTO shaft (the yoke was broken on the old one, and some previous genius had welded on the cross bearing), so I bought a fairly cheap metric one at TSC and replaced the yoke on one side with one that fit (the gear box on this has a standard 540 PTO 6-splinded shaft on it). I think that the yokes are aligned correctly - the shafts only connect one way. The hole for the top link had worn so that it was very loose as well. When I run this mower it vibrates horribly. I don't dare run it any faster than 3/4 PTO speed. I've looked, and all of the flails seem to be there. I'm going to fix the top link hole as well. Is there anything else I should look at ? So far I have $175 into this ...

[Log in to Reply] [No Email]

Bob Semrau

03-25-2002 17:06:29

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

Thanks to all - I will have the slop out of the top link tomorrow, so I can start looking at it again (although it's pretty cold here in Mich right now !).

[Log in to Reply] [No Email]

kfsmith

03-24-2002 16:45:32

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

Yup.
I had the same problem last year. When I wound up the mower it sounded like a 747. Neighbors 500 yards away came out of their houses. I think I ended up replacing and moving around 17 blades. But some had been replaced but not balanced on each side of the drum. You have to watch that the blades on opposites of the drums are both either new or worn the same ... keep it balanced!!!!

[Log in to Reply] [No Email]

bbott

03-23-2002 08:26:46

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

One more thought. Is the vibration 'high frequency' or 'low'?

If it's high frequency it's likely from something that's turning fast.. like the disks.

If it's low frequency, look to the pto drivetrain.

Good luck. Let us know what you find. Adds to everybody's 'store of knowledge' that way.

-- bbott

[Log in to Reply] [No Email]

BFO

03-22-2002 19:12:11

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

One thing I forgot. The hole on the toplink, well on mine anyway is actually a slot. Set correctly, the pin should be in the center of the slot. This allows the mower to ride on the rear roller and float over uneven ground.

[Log in to Reply] [No Email]

Bob Semrau

03-22-2002 09:18:54

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

Thanks for the answers BFO & bbot - that will give me some things to check !

[Log in to Reply] [No Email]

BFO

03-22-2002 07:24:08

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

I have a 5ft. JD 360 and it vibrates;
1. if I lift it too high and the universal joints can't handle the angle.
2. when starting out, once the rpms are up it smooths out.

After checking these two things, I would see if the shaft that the flails bolt to is bent (say if a large rock or stump tried to make its way around, or if the side bearings are worn. The fact that the yoke was broken and there was welding done should tell you that the unit had seen some rough use. HTH.

[Log in to Reply] [No Email]

bbott

03-22-2002 06:44:29

Report to Moderator

Re: Vibrating Flail Mower in reply to Bob Semrau, 03-22-2002 06:10:07

Several shots in the dark.

Bearings shot in one or more of the flail disks or intermediate drive parts. Do any of the disks have 'slop' in them?

Anything bent out on the bar? If somebody hit something hard there could be damage out there.

-- bbott

[Log in to Reply] [No Email]

Esev

03-22-2002 17:06:36

Report to Moderator

Re: Re: Vibrating Flail Mower in reply to bbott, 03-22-2002 06:44:29

I'll bet ya the drum is bent, or you have the yolks misaligned, or both. The yolks on either end of the PTO shaft should be parrallel with each other. Good luck, Esev

[Log in to Reply] [No Email]

Ron

03-22-2002 18:07:38

Report to Moderator

Re: Re: Re: Vibrating Flail Mower in reply to Esev, 03-22-2002 17:06:36

When all is well, it should just "Hummm" at about any speed..... I lost one chain w/cutter last year, and it vibrated a fair amount....replaced it, and it was fine.... Those flail mowers Have to be in pretty good balance.....!!! Good Luck..hope that is all it is..!!

[Log in to Reply] [No Email]

Tim(nj)

03-22-2002 19:14:18

Report to Moderator

Re: Re: Re: Re: Vibrating Flail Mower in reply to Ron, 03-22-2002 18:07:38

And all the flails have to be the same, too. If somebody mixed up different lengths on the rotor, that can cause balance problems.

[Log in to Reply] [No Email]

J I

04-01-2002 19:34:45

Report to Moderator

Re: Re: Re: Re: Re: Vibrating Flail Mower in reply to Tim(nj), 03-22-2002 19:14:18

Balence is the answer. Now is it the pto or the drum that is out of balance? forget the top link we run chains on ours so they can float on the rear roller. If the Flail roller is bent warped or has uneven blades on it it will viberate. High speed sounds a lot like the drum roller is out of balance not the pto. Let me know which model it is as I am running about 20 of those mower and have seen a lot of different types of bearing on them and setup that could cause a wobble in the drum roller. If you really want to fix it like a pro take the drum off and put it in a lathe and turn it for accurcy--- you will find the problem there what ever is wrong with the drum. Good luck and fix it :)

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy