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(888) 312-8812 Login SignupThe Mack Accessory Drive Belt Tensioner plays a crucial role in maintaining optimal tension within the accessory drive system of your Mack truck. Unlike some aftermarket tensioners, the Mack 21714847 utilizes a high-quality, built-in spring mechanism that applies consistent pressure. This ensures optimal performance of vital engine components, like the alternator, power steering pump, and air conditioning compressor, by preventing slippage and premature belt wear. This translates to a smoother ride, improved fuel efficiency, and extended lifespan for your belts and connected accessories.
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