The FLEETGUARD AF25509K AF4882 are rugged heavy-duty air filters engineered for industrial-grade engines. Tailored to construction, agriculture, and long-haul transportation sectors, they deliver robust contaminant protection for critical engine components. They maintain steady airflow while meeting or exceeding OEM specifications, effectively extending equipment service life. For operators navigating dusty, high-vibration, or extreme working environments, these filters stand as a reliable choice to cut maintenance downtime and minimize repair costs.

Both models feature premium multi-layered heavy-duty filtration media to achieve exceptional purification results. They capture airborne dust, sand, abrasive grit, and fine debris as small as 0.3 microns, boasting a 99.9% filtration efficiency. Adhering to strict ISO 5011 standards, they target contaminants that trigger premature engine wear, piston damage, and performance degradation. Moreover, their reinforced media structure resists tearing and clogging—even in high-dust conditions like mining sites or agricultural fields. With an outside-in flow direction design, they intercept pollutants on the media’s outer layer first. This ensures unobstructed airflow during extended service intervals, optimizing fuel combustion and sustaining reliable engine power output.

The AF25509K and AF4882 boast rugged constructions built to withstand heavy-duty operational demands. Their precision radial seal designs form tight, leak-proof fits with filter housings, eliminating bypass gaps that let unfiltered air enter engines. Weighing 2.3 lbs (AF25509K) and 2.1 lbs (AF4882), both filters have compact yet durable builds: AF25509K offers an overall height of 15.1 in (383.54 mm), outer diameter of 6.0 in (152.4 mm), and inner diameter of 3.6 in (91.44 mm); AF4882 measures 14.3 in (363.22 mm) in height, 5.8 in (147.32 mm) in outer diameter, and 3.4 in (86.36 mm) in inner diameter. Additionally, their corrosion-resistant reinforced housings resist impact, vibration, and extreme temperatures from -25°F to 260°F, maintaining structural integrity on rough job sites or during continuous long-haul operations.

These filters offer extensive compatibility with leading heavy-duty equipment brands, making them versatile replacement options. The AF25509K fits seamlessly with Caterpillar C7, C9, and 3126 models, while the AF4882 works with John Deere 8430, 9430, and 7930 series. Beyond that, they serve as direct replacements for Caterpillar part 166-6625 (AF25509K) and John Deere part RE504220 (AF4882), with cross-references to Baldwin RS3625, Donaldson P532635, and Wix 46525 filters. In terms of installation, their standardized sizes and straightforward designs enable tool-free, quick replacement—no specialized training required. Furthermore, their lightweight yet sturdy builds ease handling during maintenance, saving technicians time and reducing equipment downtime.

For more details on the AF25509K and AF4882 FLEETGUARD Heavy-Duty Air Filters, including full compatibility guides and purchasing options, visit: kxfilter.com