How do you adjust the governor on a 670 Volvo semi truck?

To adjust the governor on a 670 Volvo semi truck, locate the governor, typically found on the engine or near the fuel pump. Use a wrench to loosen the locking nut and turn the adjustment screw to either increase or decrease the RPM limit. After making adjustments, retighten the locking nut and test the truck to ensure the governor is functioning properly. Always consult the truck's service manual for specific guidelines and safety precautions.