GT275 Tranny problem

[bkussatz]

I have a 1996 GT 275 with Hydrostatic Tansmission. When I step on the forward pedal it will drive very slowly. Reverse does not move at all. One thing I did notice is that my Free Wheel- the linkage that you pull when you want to push pull or tow it will not allow it to free wheel. Does anyone know what might have happened? Any help is appreciated.

 

[955er]

Have you changed the hydro fluid and filter at the lower rear?