Went out today to plow my garden, and the 3pt lift has quit working completely. I have had a problem recently, with it, but it would work if I lifted it a little by hand and then hit the raise control. The control would not move to the raise position if the arms were all the way down. The hydraulic oil is clean and full. I turned the control speed knob, but lift still would not work in any knob position. Anyone have any ideas?