If you want to accomplish maintenance on your own Moto Morini 3 12 V then it will always be a good plan to have a Workshop Manual to keep just for a guide if perhaps you want to know tips to take off a certain component including Gearbox and match it again safely.
Moto Morini 3 12 V Workshop Manuals can offer you specified diagnostic details with regards to your vehicle so if something is broken it helps you determine what the situation is and easy methods to make it better. You can then analyse if this can be achieved by yourself or if ever the job is just too big you can actually make a reservation for your 3 12 V in to a decent garage.
Moto Morini 3 12 V manual