Collection: Belts

Marine belts: transmitting effort without slipping

A belt ensures the transmission between a motor pulley and a driven component: alternator, mechanical autopilot, pump, or accessory. The correct model depends on the groove profile, length, width, number of ribs, and acceptable tension.

Belt profile

Poly‑V belts are used when multiple ribs must transmit more power with good contact surface. V‑belts suit more conventional setups, while toothed belts are for drives where timing or mechanical grip are priorities.

Length, ribs, and compatibility

For replacement, note the reference marked on the old belt, the number of ribs, length, profile, and pulley type. A belt that is too short overloads the bearings; a belt that is too long slips, heats up, and loses efficiency.

Tension and alignment

Tension must be sufficient to prevent slipping without stressing the alternator or driven accessory. Also check pulley alignment: misalignment causes noise, vibrations, lateral wear, and risk of premature failure.

To be checked with the complete system

The belt operates with other transmission and electrical generation components. To inspect the system, see the collections alternators, pulleys, alternator accessories, power generation, and electrical systems.