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I tried to work with woodsman, the 790 openning is 20 x 36 according to specs. I asked if they could build a 22 or 24 x 36 inch.........they said no. I needed the 24" cap to get rid of junk wood. Yeah they built it from scratch with a little longer frame, longer discharge chute, and moved the axles to balance weight better.
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Don't take this the wrong way, we really liked the 1990, very well might be our next machine, I am not saying anything bad about ur chipper, very nice setup and good writeup too.
By the specs it might not seem like it but the 790hd will take a bigger log then the 1990...for better or worse, chipping pine we have sent plenty of 24" logs some ripped to 24x36", almost frightening watching them go thru