John Deere 350c Crawler will not move

[Acepilot]

I have a JD 350C Crawler with a shuttle shift forward and reverse.
It will not move, I was pushing a tree down and it stopped. Acts like it is in gear when you start, slow turnover of the engine. Once started at 1200 rpm and placed into gear the rpms drop to around 600. Will not move forward or reverse. All hydraulics work fine, no noise. PLEASE HELP.

Thanks,
Tom

[CatD8RII]

When you say "in gear" do you mean with the gearshift or the reverser? Does is still lug the engine when the transmission is in N? but the reverser in F or R?

[Acepilot]

With the reverser or shuttle shift. With the shuttle shift lever in (N) it still pulls the engine down some. But no movement forward or reverse.
Thanks