You can go to Toyota forklifts website and find a dealer close to your area. I know of a Toyota dealer in Minnesota, Toyota Lift of Minnesota, who sells the parts manual, service manual and operators manual on CD. Each manual is separate. I believe they're under $50 per manual. You can call them at 763-425-9066 and ask for parts department. Give them your model and S/N and tell them you would like a price on the service manual. The service manual should tell you what you want to know. However, being that it's an electric forklift it's likely you will need a certain gauge/analyzer to set the speed. Also it does depend on the type of electrical system too. Like if it's an EV100 I believe that the speed can be adjusted manually on the card itself. But I wouldn't recommend doing anything without the service manual. You don't want to accidently fry your electrical system. You can ask the guys in the parts department. They're nice and helpful.