This aftermarket replacement belt tensioner is a high-quality, non-OEM alternative designed to be fully compatible with New Holland part number 28556221, which supersedes the original part 87300301. Specifically engineered for a wide range of New Holland and Case IH agricultural and construction equipment, this tensioner ensures the critical function of maintaining optimal tension on your engine's accessory drive belt. Key applications for this compatible belt tensioner include popular New Holland TS series tractors (such as TS100A, TS110A, TS115A, TS125A, TS135A), TC series, T6000 series (T6010, T6020, T6030, T6040, T6050, T6060, T6070), and T7000 series tractors. It is also suitable for New Holland LB90 and LB95B backhoe loaders, as well as various Case IH Maxxum, Puma, and MXM series models that utilize the 28556221 tensioner. The primary role of this belt tensioner is to apply the correct amount of force to the serpentine belt, preventing slack and ensuring that components like the water pump, alternator, and power steering pump operate efficiently without slippage. This consistent tension is vital for reliable cooling, electrical power generation, and steering assistance. Choosing this aftermarket replacement helps to reduce wear and tear on the belt and associated pulleys, extending their lifespan and preventing costly downtime due to belt failure. It provides a durable and reliable solution for maintaining the performance and operational integrity of your machinery, offering a cost-effective alternative to the original equipment part while meeting stringent performance expectations.