V-belts and drive systems transmit rotational power from an electric motor to the main shaft of equipment such as pellet mills, hammer mills and mixers, using one or more trapezoidal-cross-section belts running in matched pulleys (sheaves). V-belt drives are widely used in feed mill equipment because they provide a degree of shock absorption and slip protection that can help protect the motor and driven equipment from sudden overload conditions, compared to a fully rigid direct-drive connection.

Belt tension, pulley alignment and belt condition are the primary factors affecting drive system performance and longevity; under-tensioned belts slip and generate heat, reducing power transmission efficiency, while over-tensioned belts accelerate bearing wear on both the motor and driven shaft.

Multi-belt drives, using several V-belts running in parallel grooves on matched pulleys, are common on higher-power applications such as pellet mills, where a single belt would be inadequate to transmit the required power; in these installations, belts are always supplied and replaced as matched sets, since individual belts in a multi-belt set can stretch at slightly different rates, and mixing old and new belts in the same drive causes uneven load sharing that accelerates wear on the newer belts.

Pulley alignment — ensuring the motor and driven shaft pulleys are properly parallel and in the same plane — is checked using a straightedge or laser alignment tool during installation and after any maintenance affecting pulley position, since misalignment causes uneven belt wear, increased noise, and added stress on bearings at both ends of the drive.

Because drive belts are a wear item subject to gradual stretching and surface degradation, most feed mills include belt inspection and replacement in routine maintenance schedules, with matched belt sets generally recommended on multi-belt drives to maintain even load sharing across all belts, and belt condition (cracking, glazing or fraying) checked visually as part of routine equipment inspection rounds.

Some larger or more critical pellet mill installations have shifted toward gearbox or direct-drive configurations specifically to avoid the maintenance demands and power transmission losses associated with large multi-belt drive systems, though V-belt drives remain widely used across the industry, particularly on small to mid-sized equipment, due to their relative simplicity, lower cost and ease of field maintenance.