John Deere 6410 tractor powershift trans broken input shaft

This topic contains 2 replies and was last updated by rob-vanderkooi 10 years 4 months ago
February 10th, 2011 8:56pm
found harmonic dampener to be in poor condition which is attached to the flywheel, theres a small driveshaft from the dampener to the input shaft on trans, is broke clean off at the seal. shaft was not fracutred before, motor mounts good, drive shaft true, input shaft bearing good, trans spins freely, the only suspect it that balancer and it seems that it has been changed once already the inner plates where the drive shaft mate to the balancer are loose, like the rubber inside the balancer is partiallly seperated
February 11th, 2011 7:28am
The damper very well could have caused a vibration and broke where the seal wore a little groove in the shaft. The wrong vibration can do alot of damage.
February 13th, 2011 7:47pm
I have seen this before and the solution was not what we had figured. when it happened again on the same tractor 6 months later we dug into the unit a little deeper and found the front and rear isolaters broken and causing the engine to bounce in the frame. Although the bolt were all tight the bounce was enough to do it again. That was 2 years agonow. I would just be sure to give the engine mounts a good look for oil soak and cracks in the rubber isolaters!

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