A disc saw felling head and a method of assembly for the disc saw felling headincluding a saw mandrel and bearing arrangement. The saw mandrel and bearingarrangement includes a housing, a mandrel, and first and second preset rollerbearing packs.One of the roller bearing packs is a tapered roller double-row preset bearingpack and theother of the roller bearing packs is a cylindrical roller single row presetbearing pack. Thehousing includes a bore and a first and second shelf, wherein each of theshelves defines adepth of the bearings with respect to the housing to accurately locate themandrel within thehousing. The use of preset bearing packs and a housing having predeterminedlocations forplacement of the present bearing packs provides an assembly which requiresfeweradjustments.
