I could hear drive belts turning slowly under the hood.

Many are coupled to it with a drive belt.

Both grinders are connected to the motor by a common drive belt.

Power is transmitted from the engine to the rotor system through drive belts.

The entire process is powered by your engine's drive belt (or belts).

The faint whistle of drive belts turning under a hood.

A big weakness of this system is that a failed drive belt would cripple the car.

Is that the drive belt as well I think.

The drive belt and weighted rollers must also be changed.

The drive belt should be checked once a month to ensure that it is in good condition.