: For standard harvesting, the engine should typically run at full throttle (approx. 2200–2400 RPM ) to ensure the hydraulic systems and threshing components have sufficient power and recovery speed.
: Lower speeds are required to prevent grain breakage, often ranging from 400 to 600 RPM .
: Higher drum speeds increase threshing capacity but also lead to a higher percentage of broken grains. For instance, increasing peripheral speed from 26.7 m/s to 33 m/s can drop the "whole grain" percentage from roughly 96% to 77%.