B7200 HST choking

[blevins756p]

I have a Kubota B7200 HST, when I put any strain on the hydorstatic drive it will not slip but choke the engine down.

I have changed all filters and fluids but this has not helped, as long as you gently push the control to move the tractor it will work, but any atempt to push the limits of the tractor will only cause the engine to stall. It will work all implements and still does an ok job but it will not handle any drive train stress at all. Does anyone have any ideas for me to check for my repair? Thanks.

 

[B2400]

Does this occur in both hi and low range?

 

[blevins756p]

It does have the problem in both high and low range but not as noticible in low range can only tell with the mower or tiller on the back in low range. This is even worse when you are trying to pull a hill. I can't figure if it is the hydrostatic system or the fuel system. Any ideas would be a big help to me.