They consist of a trio of bevel gears with a 1/1 transmission ratio.

Coaxial gearboxes reverse the direction of rotation of the through shaft while maintaining the direction of rotation of the input shaft by providing a “neutral” function in the intermediate position.

On request, the coaxial gearbox can be fitted with a third helical bevel shaft projection.

The manoeuvre is performed manually by acting on the control lever, with the machine at a standstill.

They are manufactured in sizes 24 – 32 – 38 – 42 – 55.