Yesterday I made a batch of venison jerky and I noticed that the bisques were advancing. The pusher would only come back 1/2 way some times. Other times when I went all the way it was in a jerky motion. I had to hang around and watch it most of the day. At first glance it didn't look too dirty at all. This morning I cleaned the smoke generator, took it all apart, put a little light oil on the moving parts the move the pusher. Reassembled (got all the wires back right ;)) and tested. It works fine now.