A-255010006-AI Shield Bearing, InnerOne New Aftermarket Replacement Inner PTO Shield Bearing for Bondioli & Pavesi Drivelines This inner shield bearing (also known as a PTO guard bearing) supports and allows the safety shield to rotate freely around the driveline shaft on Bondioli & Pavesi Series 1 PTO driveline assemblies. Replacing a worn or damaged inner shield bearing keeps the protective driveline guard spinning independently of the rotating shaft, a critical safety function on