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Howdy,

I have an issue with my 850 and vibration. The tractor runs great when I use the low range selection. I get a decent vibration when I use the high gear range . When i push the clutch in the vibration goes away. I replaced the belt idler today and it made no difference. The belts have only been installed for a couple of months.

I tore the drive shaft off to look a bit deeper. The front bearing spins freely with no binding or grinding. I pulled the clutch off and the Needle bearings were both packed full of clutch dust encrusted grease. I hit them with some
Wd40 and flushed them out and they spin great now. The bearing on the rear of the clutch also spins freely with no binding or grinding.

What have you guys seen out there in field with regards to high speed range vibration of the drive shaft?

I am getting a really awesome foot massage from the foot rests so my guess the cause of the vibration is mid tractor. If it was the gear box bearing I would assume i would feel the vibration in the seat. I had opened up the gear box over the winter and drained and replaced the gear oil and it was pristine back there. no damaged gears or bronze flakes at the bottom of the sump.

Thanks for the help
 

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Discussion Starter · #4 ·
The tearing apart and cleaning of the clutch assembly has resolved the issue. The needle bearings must have been the cause of most of the vibration.
 
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