I have a 97 model hs-1 mill and I'm having problems with the pallet changer when I command a pallet change it picks up then dweels then gets a code that says pallet jammed...it stays stuck in up position so I can rotate to next pallet by hand if I then turn machine off and back on and command a pallet change it works flawless...so clockwise works fine but counterclockwise it gets stuck can someone tell me what could be the issue