Skip to content
Engineered for optimal performance and durability in Mack vehicles.
The Dayco Automatic Belt Tensioner Assembly is designed to maintain consistent tension on serpentine belt drives, which power various engine accessories. This assembly features an original flat spring design that minimizes operating range variations in tension, thereby reducing the risk of premature accessory bearing failure. The innovative design also addresses common issues such as belt noise and slippage, ensuring reliable accessory performance as the belt wears over time.
Constructed with a heavy-duty cast aluminum spring case, this tensioner resists cracking and fatigue, providing long-lasting durability. The assembly includes a steel locator pin and a steel pivot tube where necessary, enhancing strength for critical torque requirements. Additionally, the lubricated nylon pivot tube bushing and spring bushing contribute to quieter operation, while the thermoplastic rubber spring slot plug protects against harmful contaminants.
The Dayco Automatic Belt Tensioner is compatible with Mack GU7, GU8, and CHU vehicles from 2008 to 2013, making it a reliable OE replacement option. With features such as a rubber O-ring for dust and grime sealing and a zinc-coated mounting bolt to resist rust, this tensioner is engineered for optimal performance in demanding conditions.
Features
- Accessory Drive Belt Tensioner Assembly
- Steel Locator Pin (Where The Application Demands)
- Heavy Duty Cast Aluminum Spring Case That Resists Cracking And Fatigue
- Heavy Duty Cast Aluminum Arm Offers Additional Strength And Less Distortion
- Steel Pivot Tube (Where The Application Demands) Provides Additional Strength For Critical Torque Requirements
- Thermoplastic Rubber Spring Slot Plug Helps Keep Out Harmful Contaminants
- Lubricated Nylon Pivot Tube Bushing And Spring Bushing For Quieter Performance
- Rubber “O” Ring Which Seals Against Dust And Grime
- Zinc-Coated Mounting Bolt That Resists Rust
Specifications
- Manufacturer: Dayco Products Inc
- Manufacturer Part Number: 89499
- Belt Type: Serpentine
- Maximum Belt Width: OEM
- Number Of Pulleys: 1
- Pulley Groove Count: OEM
- Pulley Diameter: 74 Millimeter
- Pulley Width: 38.3 Millimeter
- Pulley Material: OEM
- Tensioner Rotation: Anti-Clockwise
Shipping & Returns
- This product ships within the continental USA only.
- This product typically ships within 1 to 3 business days.
- Returns are accepted within 30 days for items in like-new condition. For complete details, please see our return policy.
