Caterpillar 479-8989 Air Filter (320, 320 GC, 323)

The 320 Badge Covers Three Different Air Cleaners

479-8989 exists because the 320 has been three machines under one name. The 320B, 320C and 320D family runs the round radial-seal element 131-8822 with 131-8821 behind it. The 320D2, 320D2 GC, 320E and 323E generation runs the round primary 528-7222 in the circular housing. The current generation — 320, 320 GC, 320 GX, 323, 323 GC, 324, 325, 326, 326 GC, 333 GC and 335 — runs the non-round UHE element 479-8989 with 479-8991 as its safety element. Nothing interchanges between those three groups, and the model decal does not tell you which one you have.

What does tell you is the housing. A round element seats on a radial seal and comes out as a cylinder. 479-8989 is an oval, panel-style element with plastic end caps; it comes out of a rectangular air cleaner body and it will not enter a round housing at any angle. Two minutes with the lid off settles what an hour of catalogue reading does not.

Why It Is UHE and Why That Matters on a 320

Caterpillar sells 479-8989 as a UHE — ultra-high-efficiency — primary element, and the description is specific: a filtration surface that extends element life up to six times that of standard filters, built for environments where extremely fine dust or soot makes up a high share of airborne contamination. That is a fair description of a 320 GC on a demolition site, on quarry haul roads or on the dusty laterite of a West African mining job, where the operator may or may not be changing the element on schedule. Higher dirt-holding capacity means restriction climbs more slowly, the restriction indicator stays green longer, and the honest servicing interval gets longer instead of the owner being forced into a short one.

The trade is the same one it always is with fine-media elements: when the element does load, it loads thoroughly, and blowing it out with compressed air pushes the retained dust through the media and finishes what the dust started. The air filter guide covers the servicing routine in the order the symptoms appear.

The Pair: 479-8989 and 479-8991

Caterpillar's own parts store lists 479-8991 as the part most often bought with 479-8989, and the 320 / 320 GC / 323 parts reference guide lists the two together under engine air filters against the ZBN, DKJ, YBL and RAZ serial prefixes. The secondary element is not an optional extra: it is the filter that keeps dust out of the engine while the primary is removed for inspection, and the one that catches the debris if a primary ever splits. Cat's filters guidance is blunt that a secondary element is never cleaned — it is replaced — and that the replacement comes at every third primary change or as required.

On a machine doing dusty work that is a two-part order roughly every other quarter, and the store that holds four primaries and no secondaries is the store that stops a machine. We quote them as a pair by default.

Cross References, and Where We Stop

Three aftermarket numbers for 479-8989 appear in more than one independent catalogue, so we publish them: SA160066, which some catalogues index under HIFI and others under Sakura; SF-FILTER SL82517; and WIX WA11217. For the secondary element, SA160067 and WIX WA11220 appear across several supplier catalogues. Everything beyond that we treat as a lead, not a cross reference.

One example is worth naming because it costs money. A widely copied supplier listing groups Fleetguard AF55312 with 479-8991. Fleetguard catalogue data places AF55312 against a different element altogether — a panel filter quoted at about 175 × 223 mm for AGCO, Cummins and Doosan applications. Ordering on that number does not get you a 320 air filter. When the sources disagree we say so and ask for the old element, rather than printing a number that reads confidently and fits nothing.

What We Do Not Publish

No servicing interval: Caterpillar sets air filter servicing per machine group, serial range and duty cycle, and the dustier the site the shorter the honest answer. No fixed price: media grade and quantity move the number, so we quote against what you actually need. And no claim that this element fits every 320 — the three generations above share a badge and almost nothing in the air cleaner.

The confirmation is free and it takes one photo. Send the number stamped on your air cleaner group, or a photo of the old element next to a tape measure, and we confirm the primary and the secondary, quote both, and ship in 3–7 days — FOB Shanghai or CIF to your port.

FAQ

Q: What is Cat 479-8989 and which machines does it fit?
A: 479-8989 is the primary engine air filter element Caterpillar lists for the current generation of 320-class machines. Cat's parts store lists it for the 320, 320 GC, 320 GX, 323, 323 GC, 323 GX, 324, 325, 326, 326 GC, 333 GC and 335 excavators, the M317, M318, M319, M320, M320 GC, M322 and M323 wheeled excavators, the D4 and D5 dozers, FM528 and FM528 LL forestry machines and the 120 motor grader. Cat's 320 / 320 GC / 323 parts reference guide lists it against the ZBN, DKJ, YBL and RAZ serial prefixes, and the companion guide covering the HEX, MYK, KTN and LKS prefixes lists the same number. Confirm the serial prefix and the old element before ordering.

Q: Is 479-8989 the same as 528-7222 or 131-8822?
A: No, and this is where most wrong orders come from. 131-8822 is the round radial-seal primary element used on the 320B, 320C and 320D family, with 131-8821 as its secondary. 528-7222 is the round primary element Cat lists for the 320D2, 320D2 GC, 320E and 323E with the circular air cleaner housing. 479-8989 is a non-round element for the next generation of 320, 320 GC, 320 GX, 323, 326 GC and 335 machines, paired with the 479-8991 secondary. The three are different shapes and do not fit each other's housings.

Q: What is the secondary element that goes with 479-8989?
A: 479-8991, the secondary standard-efficiency element, which Caterpillar's own parts store lists directly alongside 479-8989. Cat lists it for the same machine group. It is a non-round safety element published at 6.811 in wide, 2.559 in deep and 14.055 in high, and it is a separate purchase from the primary. Cat's filters guidance says a secondary element should never be cleaned and should be replaced every third primary element change or as required. Order the pair, not the primary on its own.

Q: Do you publish air filter change intervals or prices for 479-8989?
A: Neither. Caterpillar sets the servicing interval per machine group, serial range and duty cycle, and a machine on quarry, demolition or mining duty loads its air cleaner far faster than a machine on general earthworks, so a single figure published here would be wrong for most readers. Prices move with media grade, quantity and freight, so we quote the element and its pair against the grade and quantity you need. Confirm 479-8989 against the number on your air cleaner group or on the old element and we quote from there.