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Anyone know what to look for.On a 3415 vickers hydro in forward motion stops then goes. Jerks forward so bad about throws you out of seat.Oil res. is full.You move hydro from reverse to forward very jumpy.

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check the bevel gear box mounting bolts front and side.if loose they will cause the slowing and jerking sometimes raise the front wheels. sm00

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Yeah, sounds like something in the belt system (belt/BGB/pulleys), providing intermittent pump power. The Vickers are smooth as silk, otherwise.

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I have seen the four bolts that hold the tractor halves together loosen up and do the exact same thing. I would check that as well. It was like being on a bronco! The bolts had actually worn the threads off from wearing. 4 new bolts and away I went, smooth as silk!

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