Hydraulics, man what a pain. The chipper quit feeding yesterday. When you put a limb in the feed wheel stalls. Turns fine when no load. Everything else works no problem. I have isolated it down to the feed roller motors. Woodsman so dual drives on one large wheel. I had noticed when we where crushing brush sometimes the feedwheel would stall out but pick back up as soon as I let of of the down pressure. My question is do hydraulic motors wear out and instantly lose power?