A wheel loader includes: a mechanical drive unit; a mechanical drive clutch (43, 47) controlling transmission/cutoff of a power in the mechanical drive unit; an HST pump (22) driven by an engine; a hydraulic motor (23, 24) driven by a hydraulic oil deliver...

A level selecting unit is a device for selecting a tractive force level from a plurality of levels when a velocity stage of a transmission is a first velocity. The plurality of levels includes at least a first level and a second level. A control unit contr...