This DIY riding mower repair guide gives step-by-step instructions for replacing a mandrel assembly on a riding lawn mower. The mandrel assembly attaches to the deck and spins the blade. The bearings in the mandrel assembly wear down through normal use. An unbalanced blade speeds the wear on the bearings, as does hitting rocks while mowing. The mandrel assembly in this repair guide includes the blade shaft and bearings. Other mandrel assemblies can include different parts, so check the parts diagram for your mower for a complete list of parts included in the mandrel assembly (enter the model number above to find the diagram). Replace the mandrel assembly with a manufacturer-approved replacement part if the blade shaft vibrates or doesn't spin freely inside the mandrel.
Use this repair guide and video to help you replace a mandrel assembly in common Craftsman, MTD, Troybilt, Husqvarna, Ariens, Cub Cadet and Snapper riding lawn mowers and lawn tractors.