4I3948 Caterpillar hydraulic filter（4I-3948 ）

Engineered for Caterpillar heavy machinery hydraulic systems, the 4I3948 filter delivers precise contaminant capture and durable dirt-holding capacity. It efficiently removes metal shavings, sludge and abrasive fine particles from hydraulic fluid, preserving optimal oil cleanliness to protect precision pumps, valves and cylinders. It ensures low-resistance fluid flow, reduces component wear, and stabilizes hydraulic system performance in high-load, continuous working conditions.

Precision-manufactured to strict dimensional specs, this filter enables direct replacement with no extra modification. For example, it’s fully compatible with a range of Caterpillar machinery and hydraulic systems, including:

It features high-density glass fiber composite filter media. Thanks to this, it balances efficient fine particle filtration with excellent hydraulic fluid flow. The rugged metal housing offers superior pressure and impact resistance, which withstands intense system vibration and temperature swings in harsh job sites. A premium nitrile rubber seal creates a leak-proof fit, thus preventing unfiltered fluid bypass and ensuring long-term sealing reliability.

This filter achieves over 98.5% efficiency for particles ≥8 microns. Furthermore, it keeps hydraulic fluid pure and extends core component service life. Its large dirt-holding capacity lengthens replacement cycles, cutting maintenance frequency and unplanned downtime, lowering operational costs for Caterpillar mid-to-large machinery. It performs consistently in dusty construction, mining and road infrastructure sites.

Designed for Caterpillar heavy-duty construction and earthmoving machinery, the 4I3948 hydraulic filter is widely used in open-pit mining, large-scale construction, port cargo handling and road projects. All in all, it provides reliable hydraulic system protection, minimizes component wear risks, and supports steady machinery operation during long-term heavy-duty use.