heavy and tractor-trailer truck drivers

Operating self-propelled equipment such as truck or tractor that assists with reaping, harvesting, threshing, swathing, or winnowing crops such as corn, wheat; performing manual or mechanical adjustments to equipment; performing safety checks on equipment; maintaining and repairing equipment and other tools; driving truck or tractor with trailer attached for transporting crops to elevators, silos, or other storage areas, and transporting equipmen t and other tools used for harvesting from one field to another.