If you have to conduct fixes for your Moto Guzzi 750 S 3 then it is usually recommended to have a Workshop Manual to keep just for reference if perhaps you need to know ways to strip off a certain part like the Drive Shaft and match it again the right way.
Moto Guzzi 750 S 3 Workshop Manuals provides identifiable diagnostic guidelines for your car or truck therefore if something is playing up it will help you determine what the problem is and methods to fix it. You can then decide if this can be achieved on your own or in case the job is simply too big you can actually book your 750 S 3 in to a suitable repair garage.
Moto Guzzi 750 S 3 manual