Heavy Duty

With a number of industry firsts, like our flat spring tensioner design, and almost a century’s work with commercial vehicle OEMs, Dayco’s HD team keeps today’s truck fleets powered up with drive system components that provide maximum performance and fleet uptime.

Dayco Heavy Duty V-Belt

Dayco Heavy Duty V-Belt

Designed for efficient power transmission to vehicle accessories in today’s trucks and buses, farm, and agricultural equipment.

We’ve combined raw-edge construction with a specially formulated polyester cord treatment to ensure the best performance on drives that still utilize V-belts. The Dayco heavy duty V-belt also offers excellent resistance to repeated flexing and protection against heat, oil and grease, as well as the strength, stability and reliability required for vehicles that still need a heavy duty V-belt.

Dayco Heavy Duty Banded Belt

Dayco Heavy Duty Banded Belt

Designed for applications where the OE pulley design requires the use of two V-belts joined together with a common backing.

Dayco banded V-belts offer the increased strength needed for heavy duty applications requiring a banded product. The banded V-belt’s raw edge construction, three-ply laminated fabric and EPDM design ensure superior gripping power while the bottom cog construction provides extreme flexibility and cooling. By combining two belts using the common backing process, Dayco banded V-belts greatly reduce the tendency for single belts, which when subjected to fluctuating load tensions may come off or turn over in multiple pulley drives.

Dayco Heavy Duty Poly-V Serpentine Belt

Dayco Heavy Duty Poly-V Serpentine Belt

Produced for heavy duty vehicles and buses with multiple accessories (air conditioning, power steering pumps, alternators, water pumps, vacuum pumps) and operating conditions with temperatures up to 130°C/266°

Dayco heavy duty poly-V serpentine belts are made from EPDM material to resist heat and are compliant with the latest standards, guaranteeing resistance, reliability, low noise and longer service life. Engineered for high torque and power pulses, these belts also feature specially treated cords within the belt to resist stretching and ensure length stability.

Dayco Heavy Duty Idler/Tensioner Pulley

Dayco Heavy Duty Idler/Tensioner Pulley

Engineered for the demanding drive systems of today’s heavy duty commercial trucks, class 4-8.

Designed to replace idler and tensioner pulleys for serpentine drives in heavy duty diesel engine applications, Dayco heavy duty idler/tensioner pulleys are machined from high strength steel or powdered metal material to provide excellent wear resistance under harsh environments. Dual pressed-in bearings provide long bearing life and protection against the shock loads experienced by today’s diesel trucks.

Dayco Heavy Duty Water Pump

Dayco Heavy Duty Water Pump

Application specific designs for more than 97% of today’s heavy duty vehicles.

Meeting or exceeding OE specifications for fit, form and function, the Dayco heavy duty water pump uses only case-hardened roller bearings per OE design and is TS16949 certified. The outside is hardened, but the inside allows for some flex without breaking the bearing. Designed with an improved OE engineered impeller for better performance and cast iron material for enhanced durability and increased longevity, these powerhouse water pumps really go the distance.

Dayco Gold Label® Heavy Duty Belt Tensioner

Dayco Gold Label® Heavy Duty Belt Tensioner

Designed for heavy duty diesel engine accessory drive applications.

Dayco’s Gold Label® heavy duty tensioner handles higher torque and power pulses exerted by today’s diesel engines. The heavy duty cast aluminum body and pulley arms translate into extra strength and durability and the patented flat spring design prevents fluctuations to the tensioner body as its footprint doesn’t change when it’s under tension. This reduces the risk of belt noise and also helps avoid separation of the housing – a key failure many technicians see from competitive products. Our heavy duty tensioners also include rugged pulleys with dual lifetime lubricated bearings to deliver long lasting, dependable service. In addition, many Dayco Gold Label heavy duty tensioners feature highly damped designs using a wave spring and a metal ring with a bonded polymeric surface that acts as a radial shock absorber for the tensioner arm while reducing contamination.

PowerBond® by Dayco Diesel Performance Harmonic Balancer

PowerBond® by Dayco Diesel Performance Harmonic Balancer

Designed as a high-performance alternative for diesel-powered vehicle applications.

Designed with a unique combination of material and casting, the PowerBond® by Dayco diesel performance harmonic balancer provides the maximum strength and durability of bonded dampening rubber. SFI certified, a high-performance alternative for modified diesel-powered vehicle applications, these balancers are dynamically balanced for smooth operation.

Dayco Heavy Duty Serpentine Belt Kit

Dayco Heavy Duty Serpentine Belt Kit

For heavy duty diesel applications that need a highly engineered drive belt and multiple parts for a thorough and proper repair.

Dayco’s heavy duty serpentine belt kit is OE-engineered to perform in the most demanding environments where safety and productivity are essential. The belt in the kit features diesel grade construction treated to resist heat and stretching, as well as handle higher torque and power pulses. The tensioner has a unique flat spring design that helps prevent fluctuations, and helps avoid separation of the housing – a key failure many technicians see from competitive products. It also comes with heavy duty dual bearing pulleys designed to withstand the most extreme conditions.

Dayco Gold Label® Heavy Duty Flex Radiator Hose

Dayco Gold Label® Heavy Duty Flex Radiator Hose

Designed to replace molded or curved radiator hoses in today’s heavy duty vehicle applications.

Dayco’s Gold Label® heavy duty flex radiator hose is hand-built with neoprene rubber, heavy duty fabric and an embedded wire reinforcement for high burst strength and collapse resistance. With a corrugated ribbing that provides excellent flexibility while helping prevent kinks, the hose’s heavy duty construction stands up to detrimental environmental elements, such as ozone, coolants, coolant additives and temperature variations of -40°F (-40°C) to +212°F (+100°C). This hose meets or exceeds SAE J20R5, Class C requirements for heavy duty applications.

*NOT suitable for fuel or oil transfer.

Dayco Gold Label® Heavy Duty Heater Hose

Dayco Gold Label® Heavy Duty Heater Hose

Designed for heavy duty and off-road equipment service.

Dayco Gold Label® heavy duty heater hoses are made with the highest quality EPDM compounds and heavy duty spiral reinforcement to withstand high coolant and under-hood temperatures of -40°F (-40°C) to +257°F (+125°C). This hose exceeds SAE 20R3, Class D-1 standard wall construction requirements as well as Type EC electro-chemical requirements.

*NOT suitable for fuel or oil transfer.

Dayco Gold Label® Heavy Duty Silicone Heater Hose

Dayco Gold Label® Heavy Duty Silicone Heater Hose

Designed to extend the service life for heavy duty and off-road equipment applications.

The Dayco Gold Label® silicone heater hose is engineered to resist aging caused by heat, chemicals, oils and other elements. Made with special silicone compounds and reinforced with a ply of braided polyester yarn, this hose sustains up to six times longer service life than an ordinary coolant hose when installed with a Dayco lined hose clamp. In addition to being extremely flexible, the Dayco Gold Label silicone heater hose meets the requirements of SAE 20R3, Class A and has a temperature rating of -40°F (-40°C) to +350°F (+175°C).

*NOT suitable for fuel or oil transfer.

Dayco Gold Label® Heavy Duty Straight Radiator Hose

Dayco Gold Label® Heavy Duty Straight Radiator Hose

Designed for a wide range of heavy duty truck applications where the routing is relatively straight.

The Dayco Gold Label® heavy duty straight radiator hose is made with the highest quality woven mesh fabric reinforcement, neoprene cover and nitrile tube compounds to withstand the most corrosive elements in diesel engines. Providing protection from oil, coolants, coolant additives and heat, with a temperature rating of -40˚F (-40˚C) to +212˚F (+100˚C), this hose meets SAE requirements J20R1, Class B Tube, Class C Cover, standard wall construction.

*NOT suitable for fuel or oil transfer.

Dayco Gold Label® Heavy Duty Quick Fit Radiator Hose

Dayco Gold Label® Heavy Duty Quick Fit Radiator Hose

Designed to be used in commercial vehicle applications with multiple and/or small radius bends that would cause regular straight hose to kink or collapse.

Dayco’s Gold Label® heavy duty quick fit radiator hose features one ply of fabric reinforcement over a fully embedded helical steel wire for increased strength and superior collapse resistance. Developed to withstand the harshest environments found in heavy duty over-the-road and off-road applications, the cover is made with the highest quality neoprene. This hose meets the requirements for SAE J20R2, Class B Tube, Class C Cover, standard wall construction. It can also withstand temperatures from -40°F (-40°C) to +212°F (+100°C).

*NOT suitable for fuel or oil transfer.

Dayco Air Brake Hose

Dayco Air Brake Hose

Designed for use on truck and bus compressed air brake systems identified by the assembler per DOT FMVSS 571.106.

Dayco air brake hoses feature a high quality, smooth rubber cover that is weather, abrasion and ozone resistant that is reinforced by four textile spirals for a rated minimum burst pressure of 900 psi (225 psi maximum working pressure). It’s also engineered with a seamless synthetic inner tube that provides temperature protection from ‐40˚F (‐40˚C) to +212˚F (+100˚C). This hose meets SAE J1402 and DOT FMVSS 106, Type A requirements for ⅜" and ½" SP dimension hoses.

Dayco Gold Label® Heavy Duty Hump Hose, Elbows, and Reducer Sleeves

Dayco Gold Label® Heavy Duty Hump Hose, Elbows, and Reducer Sleeves

Designed as a fitting to aid in conveying air from an exterior air filter to the engine.

Dayco Gold Label® heavy duty hump hose, elbows and reducer sleeves are made from molded neoprene rubber, with smooth radii and inside surfaces to maximize air flow and keep the air column streamlined and out of the turbulent flow range. This line of fittings has a temperature range of -40°F (-40°C) to +250°F (+121°C).  Dayco Gold Label hump hose fittings allow up to 20° of misalignment and cushions the system from harmful vibrations.