General InfoThe gearboxes for speed selection applicable to systems of dosage of seeds and fertilizers in seeders replace the old
train of chain gears.
The system of key sliding has a specific number of speeds.
These kinds of system are managed by different number of handles according to the model.
It’s consisting in a couple of gears set for each handle.
The driven gear set is fixed to the shaft by a fix key and the driver gear set has a sliding key that only give transmission
to one of the gears of the set. In this way, according with the combination of the gear in the different shafts is the ratio
of the gearbox. The position of the sliding key is managed by the handles.