Quick change gear box used in 300/400HP heavyweight vehicles with mechanical and pneumatic control. It is a non-synchronized gearbox and it is divided in 2 parts:

• On the engine side are the 1st 2nd 3rd and 4th speed gears, reverse speed gears and extra low ratio pick-up speed gears. All these gears are mechanically controlled by the change gear lever.
• In the other part of the gearbox (on the output shaft side), there are the standard, low ratio and semi-low ratio speed gears, pneumatically controlled by the pre-selectors provided on the gear lever.

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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