I have a New Power-King model PK0311 Kinetic log splitter and have about 10 hours on it. I noticed that the splitting handle shuttered occasionally when I engaged it to start the ram forward. It is a bit painful on the hand. It was occurring about every 20th split but now is frequent and the handle shutters, with a grinding sound almost every time I try to engage the ram. Anyone have any ideas as to what is wrong and how to fix it?