Operates self-propelled custom class harvesting machines to harvest a variety of grain and oilseed crops. Adjusts speed of cutters, blowers and conveyers and height of cutting head, using hand tools. Changes cutting head as appropriate for crops; drives truck to transport produce to storage area. Drives harvesting machines between worksites. Services machinery, and makes in field repairs. Driving farm vehicle; minor daily and incidental upkeep to equipment and worksite.