If you wish to execute fixes on your Veli VL50QT 5 then it is always a good plan to possess a Workshop Manual for a reference just in case you want to know tips on how to strip off a particular component such as the Gearbox and match it again efficiently.
Veli VL50QT 5 Workshop Manuals gives you certain diagnostic guides with regards to your vehicle so if something is wrong it will help you figure out what the issue is and methods to correct it. You can then evaluate if you can do this on your own or if ever the job is too big you can make a reservation for your VL50QT 5 into a suitable friendly mechanic.
Veli VL50QT 5 manual