If you have to accomplish auto repairs on your own Dfang DF125 21 then it is always recommended to have a Workshop Manual to keep just for personal reference in the event you need to know ways to take out a specific part such as the Gearbox and install it again the right way.
Dfang DF125 21 Workshop Manuals provide you with specific diagnostic details with regards to your car so if something is wrong it can help you identify what the issue is and easy methods to correct it. After that you can analyse if this can be achieved by yourself or if the job is simply too big you can actually book your DF125 21 in with a trusted mechanic.
Dfang DF125 21 manual