I keep having this problem with my 3-point hitch. It goes up-down no problem. I don't use it for a few months and then it's stuck in the up position. Nothing changed - I didn't touch the adjustment knob at any point. I pulled the plastic covers off the area under the seat. I also pulled the seat and the remaining covers. I loosened the control valve (the one that the flow control knob connects to) and hydro fluid spilled out and the 3-point hitch dropped. I replaced the control valve (JB part number LVA800304) at a cost of $1,887.90 (ouch). That seemed to fix the issue. However, got the tractor back out after sitting this winter and I have the same problem. 3-point hitch stuck up. So again I loosened the control valve and the fluid spilled out and the hitch dropped. I reassembled without replacing anything and it works perfect again. It's like there is a sticking valve somewhere. Any suggestions?