JD 855 - 60 MMMower Vibration Problems: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 855 - 60 MMMower Vibration Problems: John Deere Review -- John Deere Tractors Discussion Forum

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 04-30-2009, 08:08 Post: 162404
SmittyJD



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 JD 855 - 60 MMMower Vibration Problems

I have owned my 855 with 60" belly mower for the second year now. It has always had some noticable vibration when the belly mower PTO is engaged. The mower cuts straight and even. All shafts and spindles are greased, new blades so they are not bent. I recently noticed that when the mower is engaged and raised in the air the vibration is less but it makes the whole tractor swing back and forth. When the mower is lower to ground level the vibration kicks in? Any thoughts? I am thinking the PTO shaft is out of whack but is $300+ so a costly test. Any ideas? Thank you!






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 04-30-2009, 10:54 Post: 162415
auerbach



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 JD 855 - 60 MMMower Vibration Problems

You could see if it's there when you remove the blades. If so, see if it's there when you disconnect the mower. If not, look to the mower; if so, look to the shaft.






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 04-30-2009, 11:08 Post: 162416
Murf

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 JD 855 - 60 MMMower Vibration Problems

You have something bent or out of balance, that's the only thing that can cause it.

You say they are new blades and not bent, but did you check them for balance? I've gotten brand new blades that were way off the odd time, but not very often. I suspect a reject makes it into the wrong bin every now and then in the factory.

Also, check the PTO shafts with a known straight edge, a 2' builders bubble level works well.

Finally, check that the blades are not in perfect alignment, I've seen mowers shake for no reason other than all 3 blades were lined up exactly, instead of the ideal of 120 offset to each other.

Best of luck.






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 04-30-2009, 11:14 Post: 162417
SmittyJD



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 JD 855 - 60 MMMower Vibration Problems

Thanks for the reply... Good idea trying it with the blades removed. Since they are new blades and that did not change anything I could deduce it was a spindle, the belt, or the shaft.

I could disconnect the belt and try to run the PTO to see if the shaft was creating it.

Will replace the belt to test that, relatively cheap and good to have a replacement.

How could I test the spindles individually? None of them feel like there are bearings missing, etc. I also measured the distance on both ends of each blade to the edge of the deck to get a reference and it appears as though no spindles are bent.







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 04-30-2009, 12:11 Post: 162421
Murf

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 JD 855 - 60 MMMower Vibration Problems

Quote:
Originally Posted by SmittyJD | view 162417
How could I test the spindles individually?



Lift the mower as high as you can and park the tractor on a concrete floor with the engine off.

Next take tape measure and set it on the floor with the tape extended up (and locked) to the very tip of a mower blade. Now by hand spin the blade 180 to the other end, if something is off the other side will either be higher or lower than the first side. Repeat on all three blades.

Best of luck.






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 04-30-2009, 14:03 Post: 162425
SmittyJD



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 JD 855 - 60 MMMower Vibration Problems

Thanks a lot Murf and auerbach. Super HELP! Have a good one






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 04-30-2009, 16:41 Post: 162437
kthompson



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 JD 855 - 60 MMMower Vibration Problems

Have you grabbed hold of the pto shaft and tried to see if it has any loose motion in it (of course with tractor off EW). No idea on this but asking..can a shop who balances drive shafts test a pto shaft for balance? There is probably such a shop in your area, ask big truck repair shop who makes or repairs drive shafts for them.






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 04-30-2009, 19:00 Post: 162439
leejohn



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 JD 855 - 60 MMMower Vibration Problems

Sounds like ujoints too me.






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 04-30-2009, 21:35 Post: 162445
SmittyJD



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 JD 855 - 60 MMMower Vibration Problems

Quote:
Originally Posted by kthompson | view 162437
No idea on this but asking..can a shop who balances drive shafts test a pto shaft for balance?



I bought it from a guy who got it when he bought a house. I think I remember him mentioning the guy tried to have the shaft balanced. If I grab it there is about 1/4 inch to 1/2 inch of play. Is that normal or too much?

Thanks






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 05-01-2009, 09:25 Post: 162452
Murf

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 JD 855 - 60 MMMower Vibration Problems

Quote:
Originally Posted by SmittyJD | view 162445
If I grab it there is about 1/4 inch to 1/2 inch of play.Is that normal or too much?



That's a lot less than some of mine, and there's no shaking in them.

Best of luck.






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

Thread 162404 Filter by Poster:
auerbach 1 | earthwrks 1 | Hettric 1 | JD-855-in-WI 1 | jdgreen 1 | kthompson 1 | leejohn 1 | Murf 3 | SmittyJD 5 |




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