Gear Hub Adjustment
Remove the plastic cover for gear adjustment (1)
Select 2nd gear (the middle one) from the shifter and turn the pedal crank forward to ensure the gear is engaged. Turn the cable. Turn the cable connector (3) until the end of the indicator rod is level with the end of the axle, as show in the picture (4). Tighten the cable-adjusting locknut (2) to lock in adjustment.
Select 3rd gear position, rotate the pedal crank, change back to 2nd gear and check adjustment. Retry the stages description above when the gear changing is not correct. Fit the indicator cover firmly onto the guide pulley set.