Try-H Engine Air Filter for Freightliner Cascadia - 03-42776-010 Direct-Fit, Multi-Layer Media

The Try-H 03-42776-010 engine air filter is a direct-fit replacement for 2019–2022 Freightliner Cascadia models, engineered to trap dust and fine particles while preserving airflow to the engine.

This replacement air filter (OE 03-42776-010; also listed as 91559, TR504-EF, 0342776010, 997879) is built from multi-layer composite media and a sturdy frame designed to resist deformation and temperature stress found in heavy-duty engine bays. It’s intended as a factory-matched substitute so you can install it quickly without modifying the intake assembly, helping maintain intake system cleanliness and consistent engine performance.

How does this filter protect my Freightliner Cascadia engine?

The multi-layer filter media captures airborne dust, road debris and fine particulates before they enter the intake system. By stopping contaminants at the intake, the filter helps reduce abrasive wear on internal engine components and keeps throttle and turbo systems cleaner over time.

• Multi-layer composite media traps both large and fine particles.
• Durable frame resists deformation under heat and vibration.
• Factory-compatible dimensions ensure full sealing in the housing.

When should I replace the 03-42776-010 air filter?

Replace the filter at regular intervals to maintain airflow and filtration efficiency; typical guidance is every 12 months or about 12,000 miles under normal conditions. Inspect the element more often if you operate in dusty or off-road environments, or if you notice reduced engine responsiveness or increased intake restriction.

• Suggested interval: every 12 months or 12,000 miles.
• Check sooner in dusty, construction, or off-road use.
• Replace immediately if heavy deposits or visible damage appear.

Is installation straightforward for a technician or fleet mechanic?

Yes—this Try-H unit is manufactured to match the Freightliner OEM shape and sealing surfaces, which means installation requires no aftermarket modification. A standard airbox access and basic hand tools are usually all that’s needed to swap the old element for this replacement.

• Factory-matched form for quick, tool-accessible replacement.
• One-piece element simplifies handling and alignment.
• Fits OE references: 03-42776-010, 91559, TR504-EF, 0342776010, 997879.

What are the construction and material benefits of this replacement?

The filter uses layered composite media combined with a resilient frame to balance airflow with effective particulate capture. The materials resist temperature and vibration in engine compartments, helping the filter maintain shape and filtration performance through extended service intervals.

• Layered media for improved particle separation and airflow.
• Reinforced frame reduces risk of deformation and air bypass.
• Designed for heavy-duty thermal and vibration conditions.

Who is this for: Fleet managers, owner-operators and maintenance technicians who service 2019–2022 Freightliner Cascadia trucks and want a reliable, OEM-fit air filter replacement. It’s suitable for vehicles under routine highway use as well as mixed service where a durable, high-efficiency intake filter is required. Choose this Try-H 03-42776-010 filter if you need a direct-fit element that matches OE references (03-42776-010; 91559; TR504-EF; 0342776010; 997879), simplifies installation and helps keep intake systems cleaner between scheduled maintenance intervals.