An agricultural implement having an infeed cutter is operable to automatically accommodate large objects that pass through the infeed cutter and detect and counteract jams that occur or might otherwise occur in the infeed cutter. The implement includes a plurality of knives mounted on a vertically moveable knife bed. The bed is associated with a hydraulic load-sensing system that is operable to lower the bed if a load threshold has been reached and raise the bed when the load has decreased sufficiently. Each knife is also associated with a hydraulic load-sensing system that is operable to lower the respective knife if a load threshold has been reached and raise the respective knife when the load has decreased sufficiently.
