Shift actuator, vehicle having the same, and method for mounting shift actuator

A shift actuator to be mounted to a vehicle equipped with a power unit including a transmission including a plurality of gears, a shift shaft arranged to change the gears of the transmission, and a casing arranged to cover the shift shaft and the transmission so as to expose part of the shift shaft externally, the shift actuator comprising:

• a primary drive;
• an output shaft arranged to be connected directly or indirectly to the exposed part of the shift shaft;
• a power transfer mechanism interposed between the primary drive and the output shaft and arranged to transfer a driving force from the primary drive to the output shaft and to transfer no driving force from the output shaft to the primary drive;
• a housing arranged to support the primary drive, the output shaft, and the power transfer mechanism;
• and
• a position sensor supported by the housing and arranged to sense the position of the output shaft.