Power Flow, 1st Gear

The input shaft rotates clockwise and is connected to the rear planetary gear train's (P1) ring gear by clutch C1. The result is that the input shaft and the rear planetary gear train's ring gear rotate clockwise as a unit.

Freewheel F2 prevents the front planetary gear train's (P2) ring gear from rotating counter-clockwise.

The planet gear runs clockwise on the inside of the front planetary gear train's ring gear at the same time as it rotates counter-clockwise.

The planet carrier and the driven intermediate gear rotate clockwise as a unit at a lower speed than the input shaft.

Since the driving intermediate gear rotates clockwise, the driven intermediate gear and the lower planetary gear trains (P3) ring gear rotate counter-clockwise as a unit.

The lower planetary gear train's planet gear rotates counter-clockwise.

Brake B4 and freewheel F3 prevent the lower planetary gear train's sun wheel from rotating.

The lower planetary gear train's planet gear runs counter-clockwise round the sun wheel at the same time as it rotates. The lower planet carrier and the final gear rotate counter-clockwise as a unit at a lower speed than the driven intermediate gear.