Branson 3015h, Owner'S Manual

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Chapter 4 transmission
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As the HST input shaft (pump shaft) (1) is rotated by the engine torque, the internal piston delivers hydraulic
pressure to the HST motor shaft (2).
The HST pump shaft is installed with the swash plate which is tilted between -18° and +18°. The angle of the
swash plate is changed according to the depressing condition of the HST pedal.
When the swash plate of the HST pump shaft starts to tilt toward the positive x-axis from 0° (neutral position)
gradually, the amount of hydraulic oil delivered to the HST motor shaft is increased, resulting in increase of
the vehicle speed. When the swash plate moves toward the negative x-axis from 0°, the delivery direction of
hydraulic oil is reversed, resulting in reverse rotation of the HST motor shaft.
Therefore, the rotating direction of the HST motor shaft is switched between forward direction and reverse
direction according to the selected direction (forward/reverse driving) of the HST pedal, and this direction
control is applied to gears in the transmission to drive the vehicle forward or backward.
hst modeL