Systems and methods for replacing a removable assembly from a harvester for collecting and separating harvested crop product from twigs, dirt, dust, and other debris. A removable assembly for picking up harvested crop product and a removable assembly for separating the picked up harvested crop product from twigs, dirt, dust, and other debris are mounted to be changed out quickly in the field. A removable pickup assembly is received for removably mounting in the harvester by an inclined slot formed in a sidewall of the harvester body frame, so that the removable pickup assembly with the worn belt is lifted up and out and a replacement removable pickup assembly with a new belt is dropped into its place.