A tracked vehicle includes a track operatively connected to a driveshaft. An
output
shaft of a hydrostatic motor is selectively rotationally engaged with the driveshaft
via a clutch mechanism. When the clutch mechanism is engaged, the motor drives
the track. When the clutch mechanism is disengaged, the tracked vehicle may be
towed without rotating the output shaft of the motor. The clutch mechanism includes
splined surfaces on the driveshaft and output shaft that are adapted to rotationally
engage a splined surface of an axially-movable clutch shaft. The clutch mechanism
further includes an engagement controller that selectively axially moves the clutch
shaft into and out of rotational engagement with the output shaft while maintaining
continuous rotational engagement between the clutch shaft and the driveshaft.
