479-8991 479-8989 Heavy Duty Air Filter Set for Caterpillar C4.4 C7.1 Excavators

Description

The 479-8991 479-8989 air filter set is a primary and secondary air filter combination engineered for Caterpillar C4.4 and C7.1 engines used in the 320GC, 323GC, 326GC and M320GC excavator series. According to Caterpillar’s own parts classification, 479-8989 is the primary Ultra High Efficiency element, while 479-8991 is the secondary Standard Efficiency element — together providing two-stage protection against dust and airborne debris in demanding earthmoving environments. IXIN Filter manufactures both elements to OEM-equivalent specifications, giving fleets and dealers a reliable, factory-direct alternative for scheduled air filter replacement.

As a TS16949-certified filter manufacturer, IXIN supplies the 479-8991 479-8989 air filter set to distributors, equipment dealers and service centers in 60+ countries, with consistent batch quality and full traceability for bulk and OEM orders.

Product Specifications

Compatible Caterpillar Equipment

• Cat 320GC Excavator
• Cat 323GC Excavator
• Cat 326GC Excavator
• Cat M320GC Excavator
• Cat M322 Excavator
• Also commonly cross-referenced for Cat 320 / 323 excavators and 120 / 120AWD Motor Graders using the C4.4/C7.1 engine platform

479-8991 / 479-8989 Cross Reference / OE Replacement Numbers

The 479-8991 479-8989 air filter set is a direct cross reference and replacement for the following OE and aftermarket part numbers:

Note: Confirm your machine’s exact model, serial number range and production year against the OE part number before ordering, as Cat GC-series excavators and Motor Grader models can share filter housings across sub-models.

Why Choose IXIN’s 479-8991 479-8989 Air Filter Set

• Two-Stage, Differentiated Filtration — The primary element (479-8989) uses Ultra High Efficiency media rated for extended filter life and superior dirt-holding capacity, while the secondary element (479-8991) provides Standard Efficiency backup protection during servicing or if the primary filter is compromised.
• Built for Excavator Duty Cycles — Engineered for the dusty, high-vibration conditions typical of hydraulic excavator and motor grader operation on construction and earthmoving sites.
• OEM-Equivalent Fit — Manufactured to match OE dimensions and efficiency classification for both 479-8989 and 479-8991, supporting drop-in compatibility across the compatible Cat GC-series range.
• Factory-Direct Supply — As a manufacturer (not a trading company), IXIN offers stable lead times and customization options for private label, packaging and media specification.
• Bulk & OEM Pricing — Volume discounts available for equipment dealers, distributors and fleet operators. For guidance on verifying cross reference numbers before a bulk order, see our fuel filter cross reference guide — the same verification principles apply across air, fuel and hydraulic filter categories.

Installation & Maintenance Notes

For Cat 320GC/323GC/326GC/M320GC excavators using this air filter set, general service steps include:

1. Shut down the engine and allow the air intake system to cool before servicing.
2. Remove the air filter housing cover and take out the primary element (479-8989) first.
3. Inspect the secondary element (479-8991) — as a general rule, replace it every 2–3 primary element changes, or immediately if it shows visible contamination, and never clean/reuse it.
4. Check the housing and seals for dust ingress or damage before installing new elements.
5. Install the new primary and/or secondary element, ensuring the gasket seats evenly to prevent unfiltered air bypass.
6. Follow your specific Cat model’s recommended service interval — dusty environments typically require more frequent primary filter inspection, so always confirm against your machine’s maintenance schedule.

FAQ

Q: What’s the difference between the 479-8989 primary and 479-8991 secondary elements? A: Per Caterpillar’s own parts classification, 479-8989 is the Primary Ultra High Efficiency element, designed for extended filter life and higher dirt-holding capacity, while 479-8991 is the Secondary Standard Efficiency element, which serves as a backup safety filter. Both are typically sold and serviced as a set.

Q: Do I need to replace both elements at the same time? A: Not necessarily. The primary element (479-8989) is serviced more frequently based on restriction indicators or visible contamination, while the secondary element (479-8991) is typically replaced less often — commonly every 2–3 primary filter changes — unless it becomes visibly dirty or damaged.

Q: Is this air filter set compatible with all the listed Caterpillar models? A: The 479-8991 479-8989 set is designed to fit Cat 320GC, 323GC, 326GC, M320GC and M322 excavators using the C4.4/C7.1 engine platform. Confirm your machine’s exact model and serial number range against the OE part number before ordering.

Q: Can I order the 479-8991 479-8989 set with custom packaging or private label? A: Yes. IXIN supports customized packaging, labeling and media specifications for distributors and private-label buyers. Contact our sales team with your requirements.

Q: What is the minimum order quantity (MOQ)? A: MOQ varies by customization level. Get in touch with us via WhatsApp or email for current MOQ and lead time on the 479-8991 479-8989 air filter set.