Parts - Service + Parts | CLAAS CLAAS ORIGINAL parts are precision-manufactured, high-quality series components for CLAAS machines. Reliable. CLAAS ORIGINAL parts have a longer life cycle and protect the machine from mechanical failure. Efficient. CLAAS ORIGINAL parts are renowned for their high cost-effectiveness, and quality that pays off. Catalogue - Service + Parts | CLAAS Parts Doc Online is the CLAAS electronic spare parts catalogue. It contains spare parts for CLAAS harvesting machines and CLAAS tractors. The version available here gives you access to all current machine details. Spare parts cannot be ordered online – please talk to your local CLAAS partner. Click here to go to the catalogue.