Heavy vibration with Titan 5' Rotary Cutter

[Page546]

Hey folks,

I may be answering my own question but just wanted other opinions to keep me honest . I have an L4060 with a quick hitch. I had recently purchased a rotary cutter however when I was assembling it the PTO shaft was too short when in use with the quick hitch. The brush cutter worked fine but still vibrated a little.

I had taken my PTO shaft to my local tractor repair shop and they only had material to lengthen the inner shaft not the outer. So my question is does both the outer and the inner shaft have to be the same to keep the balance? If so do you think because the inner shaft is twice as long as the outer that would be causing the crazy amount of vibration?

All input would be appreciated! Common sense tells me its the PTO shaft, but just want to get other opinions.

Thank you,
Page546

 

[hodge]

I would suspect that the driveshaft is your culprit.
I'm surprised that the repair shop did the work, if they could only do it half way.

 

[russell.still.5]

How exactly did they lengthen it?


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[Sid Post]

Finish the job which was only partially completed.

 

[Russell King]

I really doubt the shaft would cause much vibration unless it is not put together correctly. The u joints have to be turned correctly or that causes issues. U joint timing is the term to search.

But you should get it fixed correctly anyway.

Look and make sure the blades under the mower are free to rotate around there bolted joint. Also make sure the blades are basically the same on both sides.

If you can buy new blades or verify the ones installed are correct for the mower since you just got it.


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[Cathy Liebchen]

I would suspect that the driveshaft is your culprit.
I'm surprised that the repair shop did the work, if they could only do it half way.

bent drive shaft will vibrate wildly

 

[AKguy09]

I really doubt the shaft would cause much vibration unless it is not put together correctly. The u joints have to be turned correctly or that causes issues. U joint timing is the term to search.



I've heard it called being "in Phase" as well

 

[Sid Post]

If the pto shaft lengths aren't matched, wobble and bending are apt to occur.

 

[Page546]

Cannot thank everyone enough for their input!

So I double checked the blades to make sure they weren't bent or anything. Made sure everything was level and set so at this point i'm bringing the PTO shaft back in to be fixed correctly. Its an old tractor repair shop that is a 1 man show and rather than buying a new PTO shaft 40 bucks is worth it to get it extended. This time i will make sure i ask him how/what he did to extend and will provide feedback to everyone.

Thanks again for the input!

 

[adventure bob]

I'm curious how "If the pto shaft lengths aren't matched, wobble and bending are apt to occur. " Please explain the logic of this statement.

I think the more likely cause is how they lengthened it or put it back together. Did they weld your old yoke to a new piece of shaft? Did they just use a new half? The quick check would be to rotate your yokes, i.e. slide the shafts apart and clock them 180 deg from where they are now.