Sounds like you guys have answered the question I came here for. Picked up a Wallenstein bx42 over the weekend. I was really disappointed that I jammed it three times in less than half an hour. It was jamming when I was putting green pine and cedar through it. I think it is partly because of the sticky sap, and the way the leaves or fronds of the piice spread out and catch on the outfeed. The outfeed looks like it is about 6" across at the start just above the chipping wheel, and then necks down to about 4" at the junction that holds the pivot for the chute. I will lay off the evergreens and run just other stuff through it for a day and see what happens.
What speed am I supposed to run the PTO at? I have 540 or 720. What RPM on the engine is needed? I have a Jinma 354 diesel. I have always used 540 with a brush hog and tiller, so was hesitant to run at 720. Maybe if I crank up the speed it won't jam. I was thinking more power vs more speed.