The AF25544 FLEETGUARD is a superior air filter integrated with Purity Core technology, engineered for heavy-duty engines. It serves construction, agriculture, and mining sectors, delivering top-tier contaminant protection for critical engine components. It maintains consistent airflow while meeting or exceeding OEM specifications, effectively extending equipment service life. For operators facing harsh, dusty environments, this filter is a reliable choice that reduces maintenance downtime and minimizes repair costs.

This filter leverages premium multi-layered Purity Core filtration media to achieve outstanding purification results. It captures airborne dust, sand, abrasive particles, and fine debris as small as 0.3 microns, boasting a 99.9% filtration efficiency. Adhering to strict ISO 5011 standards, it targets contaminants that cause premature engine wear and performance degradation. Moreover, its reinforced media structure resists tearing and clogging—even in extreme dust conditions like mining sites or agricultural fields. With an outside-in flow direction design, it intercepts 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 AF25544 boasts a rugged construction tailored to heavy-duty operational demands. Its precision radial seal design forms a tight, leak-proof fit with the filter housing, eliminating bypass gaps that allow unfiltered air to enter the engine. Weighing 2.2 lbs, the filter features a compact yet durable build: overall height of 14.8 in (375.92 mm), outer diameter of 5.9 in (149.86 mm), and inner diameter of 3.5 in (88.9 mm). Additionally, its corrosion-resistant reinforced housing resists impact, vibration, and extreme temperatures from -25°F to 260°F. This sturdy design maintains structural integrity on rough job sites, during continuous operation, or in high-humidity conditions.

The AF25544 offers extensive compatibility with leading heavy-duty equipment brands, making it a versatile replacement option. It fits seamlessly with Caterpillar C11, C13, and 3406E models, as well as John Deere 9460R, 8460R, and 7460R series. Beyond that, it serves as a direct replacement for Caterpillar part 166-6630 and John Deere part RE504225, with cross-references to Baldwin RS3630, Donaldson P532640, and Wix 46530 filters. In terms of installation, its standardized size and straightforward design enable tool-free, quick replacement—no specialized training required. Furthermore, its lightweight yet sturdy build eases handling during maintenance, saving technicians time and reducing equipment downtime.

For more details on the AF25544 FLEETGUARD Superior Air Filter – Purity Core, including full compatibility guides and purchasing options, visit: kxfilter.com