The belt drive system transfers rotational power from the crankshaft to engine-driven accessories including the alternator, water pump, fan, air compressor, and hydraulic pump. V-belts and poly-V (ribbed) belts are the most common types used on Cummins engines. Automatic belt tensioners maintain correct belt tension to prevent slipping or excessive wear. The engine cooling fan — driven either by belt or directly through a fan hub and clutch assembly — provides airflow through the radiator. A failed belt can disable multiple systems simultaneously (charging, cooling, air compressor), making belt condition a critical item in any engine inspection.
AMS Parts supplies a wide range of belts, pulleys & fans components for Cummins engines used in power generation, marine, and industrial applications. Browse a selection of available parts below, or contact us for specific requirements.
Below is a selection of belts, pulleys & fans parts we supply. Use the search bar above to find a specific part number, or request a quote. You can also reach us directly at [email protected] or +44 7776 800169.
Inspect belts for cracking, fraying, glazing, or excessive wear on the rib surfaces. Most Cummins engines recommend belt inspection at every service interval, with replacement based on condition or at the interval specified in the maintenance manual.
The automatic belt tensioner maintains correct belt tension using a spring-loaded arm. Over time, the spring loses force and the tensioner bearing can wear, resulting in belt slip, squeal, or misalignment. A tensioner that no longer holds steady tension or has visible bearing play should be replaced.
Yes. If the fan hub or fan clutch fails, the cooling fan may not engage or may spin at insufficient speed, reducing airflow through the radiator. This is especially critical in stationary generator applications where there is no ram air effect from vehicle movement.
