If you choose to execute adjustments on your own Jialing JH125 33 then it is usually recommended to have a Workshop Manual for a reference if you need to know methods to strip off a specific component much like the Gearbox and match it again accordingly.
Jialing JH125 33 Workshop Manuals will give precise diagnostic wisdom on your car therefore if something is broken it helps you ascertain what the problem is and methods to make it better. You can then assess if this can be done on your own or if the job is too big you could make a reservation for your JH125 33 in with a nearby garage.
Jialing JH125 33 manual