2. Adjust rotor speed in proportion to concave settings. “For Deere combines, 400 rpm is a good starting spot,” says John Peters, John Deere product marketing manager for combines and headers.

This rare 1990 John Deere 9501 pull type combine with 912 header sold for $16,871 (U.S) at a central Saskatchewan farm auction on July 17. Machinery Pete’s Pick of the Week via text message each ...