Dayco 89931 Heavy Duty Automatic Belt Tensioner

The Dayco 89931 is a heavy-duty automatic belt tensioner designed for commercial truck and heavy equipment applications. This tensioner automatically maintains proper belt tension throughout the life of the serpentine belt system, compensating for belt stretch and wear to ensure optimal performance of engine accessories.

Key Features:

• Heavy-duty construction built for severe-service applications
• Automatic tensioning mechanism maintains consistent belt tension
• High-quality spring and bearing assembly for extended service life
• Precision-engineered pulley ensures proper belt alignment
• Direct replacement design for straightforward installation
• Reduces belt wear and slippage for improved accessory drive performance

Dayco automatic belt tensioners are engineered to meet or exceed OEM specifications, providing reliable performance in demanding commercial vehicle applications. The tensioner helps prevent belt-related failures and reduces maintenance requirements by automatically adjusting for belt wear over time.