This oil seal sits in the drive system of a self-propelled forage harvester, retaining lubricant and excluding contaminants at the shaft exit point. It is installed where the rotating shaft passes through the housing, preventing leakage and protecting bearings and gears from dirt ingress. A worn seal allows fluid loss and contamination ingress, which accelerates bearing wear and can lead to driveline noise or failure. Corteco manufactures this seal to match the original housing bore and shaft dimensions, preserving the correct interference fit without requiring shimming or adapter rings. On reinstallation, inspect the shaft surface for scoring and lubricate the seal lip before assembly.