The Kohler 918-06977A Lawn Tractor Mandrel Assembly supports the mower deck blade spindle, allowing the blade to rotate during grass cutting. It provides the mounting structure and bearing support needed to maintain blade alignment and transfer rotational movement through the assembly. Proper mandrel operation helps the mower deck perform its cutting function during use. Replacing a d... https://www.wholetoolbox.com/kohler-918-06977a-lawn-tractor-mandrel-assembly/918-06977A.html