Heavy Duty Poly-V / Serpentine Belt Drive Components

SKU: APV-HD, ATB-HD Category:

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The increase in engine performance and the continuous increase in accessory components have been considered during the design development and choice of materials used for all belt drive components.

The control components for accessory devices, with both fixed and automatic tensioning, must meet the growing needs of the manufacturers:

  • Increasingly reduced workspaces
  • High temperatures
  • Continuous stress
  • Increase in the component replacement interval

It follows that both tensioners and pulleys/belts of the system must meet extremely high quality standards.


As the major supplier to heavy duty original equipment manufacturers, Dayco Heavy Duty Tensioners are guaranteed to be engineered and manufactured to the strictest design specifications. Designed for heavy duty diesel engine accessory drive applications, the heavy duty cast aluminum body and pulley arms translate into extra strength and durability.

The Dayco heavy duty tensioner features multiple patented components that are engineered to handle the higher torque and power pulses exerted by today’s diesel engines. Rugged pulleys with dual permanently lubricated bearings deliver long lasting, dependable service. In addition, many of Dayco heavy duty tensioners feature highly damped designs using a wave spring and a metal ring with a bonded polymeric surface to act as a radial shock absorber for the tensioner arm while reducing contamination.


The performance demands of original equipment manufacturers of over-the-road trucking and off-road equipment requires a built-for-punishment heavy duty construction.

Designed to replace idler and tensioner pulleys for serpentine drives in heavy duty diesel engine applications, Heavy Duty Pulleys are manufactured from steel, powdered metal, or engineered polymer materials to resist wear under harsh environments. Each heavy duty pulley from Dayco features dual permanently lubricated sealed bearings and retainers to provide long life despite the shock loads experienced in diesel engine applications.

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