Abstract: An orbital lathe for resurfacing a fifth wheel kingpin having a support column insertable between the kingpin and an underlying surface generally axially aligned with the kingpin. A cutting tool is mounted for rotation about a pin axis and has a first positioner for moving the cutting tool radially relative to the pin axis and a second positioner for rotating the cutting tool about an axis generally orthoginal to the pin axis. A driver is provided for rotating the cutting tool about the pin axis to cause the cutting tool to remove material from the kingpin. A transport mechanism acts between the support column and the first and second positioner to move the first and second positioners and in turn the cutting tool along the pin axis.