If you want to accomplish adjustments on your Orion A30E125M then it is usually a great idea to have access to a Workshop Manual to keep just for personal reference just in case you need to know how you can strip off a specific component like the Gearbox and match it again perfectly.
Orion A30E125M Workshop Manuals provides certain diagnostic information for your car therefore if something is broken it can help you discover what the problem is and tips to repair it. After that you can assess if you can do this on your own or if the job is simply too big it is possible to make a booking for your A30E125M in to a suitable garage.
Orion A30E125M manual