The 20 series engine is a complete new design. There is a tne84t which would be a turbo 4310 engine. I have found in on Yanmar sites, and on marine engine/construction equipment sites.
But It probably is more cost effective to sell your tractor and buy a 3520...
On the 4000 20 series tractor they are using a JD engine versus a Yanmar in the 4000 10 series. I'd say there would be a lot of retrofitting involved. It would not be a bolt on upgrade.
I am not up on the 3000 20 series though.
I told my dealer last week I was mad at JD. I bought a 4710 in Oct. of 2003. JD announced the 4000 20 series launch a few months later. I would have definitely gone for the JD turbo rather than the non-turbo Yanmar.
Timing is everything!
I have no complaints with my 4710. The power is awesome and have about 300 hrs on it with no problems. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
</font><font color="blue" class="small">( I have no complaints with my 4710. The power is awesome and have about 300 hrs on it with no problems. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif )</font>
The proof is in the pudding....The Yanmar's are hard to beat for durability. I hope the new JD engines prove durable for the long haul.