https://www.searspartsdirect.com/model/1xtw2fkbal-000736/mtd-13boa1zs093-front-engine-lawn-tractor-parts
Remove Tuff Torque K46 transaxle, remember SAFETY FIRST, drain, disassemble, inspect all parts for wear, order new parts, reassemble & add new 5w-50 full synthetic oil, reinstall, bleed air...