Volvo D13 Mack MP8 Tensioner - Premium Automatic Assembly - Replaces 21819687

Keep your accessory drive performing at peak efficiency with this Premium Volvo D13 Mack MP8 Tensioner by FleetPro Parts & Tires. Engineered for the "New Generation" of heavy-duty powerplants (2015–2026+), this automatic tensioner assembly is the latest supersession in the 21819687 series. Unlike standard spring-only units, this premium assembly features an integrated hydraulic damper to neutralize the extreme vibrations of high-torque diesel engines. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for owner-operators and fleets across the Midwest and nationwide.

Advanced Engine Protection: The Volvo D13 Mack MP8 Tensioner Advantage

This Volvo D13 Mack MP8 Tensioner is a professional-grade solution designed to prevent the common "belt slap" and accessory bearing failure seen in high-mileage trucks. Manufactured with high-strength 4140-grade steel components and a weather-sealed pulley, it automatically adjusts for thermal expansion and belt stretch. Note: This is the most current revision, featuring an improved internal spring and upgraded hydraulic damping for a rated lifespan of up to 1,000,000 miles in fleet environments.

At FleetPro Parts & Tires, we prioritize safety-critical engine hardware that meets or exceeds strict Volvo Group standards. This unit is a direct replacement for Volvo 21819687 and 21422765, providing a "drop-in" fit for your VNL, Anthem, or Granite. Replacing your tensioner alongside your belt is the smartest way to prevent roadside breakdowns and ensure your alternator and water pump remain fully operational under load.

Vehicle & Engine Fitment

This automatic tensioner is precision-engineered for the following 2015–2026+ applications:

• Volvo Engines: D11 & D13 (VNL 760/860, VNR, VHD, VN)
• Mack Engines: MP7 & MP8 (Anthem, Granite, Pinnacle, CXU)
• Chassis Compatibility: Fits post-2018 "New Generation" VNL trucks and Mack Anthem series.

Direct Replacement & Cross-Reference Numbers:

This assembly is the latest revision and replaces all previous versions in the supersession chain:

• Volvo/Mack OEM: 21819687, 21422765, 20935521, 20739751, 85013316, 85020237
• Gates: 38607, 38671, 89941, T38607
• Dayco: 89458, 89941, APV1151
• Continental / Litens: 49580, 49608
• Newstar: S-23525, MK-21819687

Technical Specifications

• Type: Hydraulic Automatic Belt Tensioner
• Pulley Diameter: 70-80mm (Smooth Surface)
• Mounting Torque: 40-50 Nm (30-37 ft-lbs) recommended
• Temperature Rating: Up to 250°F (121°C)
• Weight: 2.8 lbs
• Finish: Corrosion-Resistant Powder Coat
• Brand: FleetPro Parts & Tires