The gearbox is composed of a central box containing 4 forward speeds gearings and 2 reverse speeds gearings, epicyclic unit for selecting the speed-gears mounted on the base and over-gear on top. The over-gear allows to divide each gear into slow or fast obtaining 16 forward gears which can be inserted and geared down in sequence.

This cutaway model is carefully sectioned for training purposes, professionally painted with different colours to better differentiate the various parts and cross-sections. Many parts have been chromium-plated and galvanised for a longer life.

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