Jd 2840

I have a 2840 john Deere. I changed the hyraliuc fluid and filter screen. I also changed out the control value o-rings and the gaskets and o-rings on the gear shift housing. Put new fluid in. Now after bush hogging for a bout 30 min or when fluids get hot, fluid is coming out of the gear shifter leavers. It's not pressure it like it's over filled. Just going down hill. I have talked to a couple of dealers and they just want to start changing parts. Oh and everything works like it should

Jd 2840