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Excavator Filters

479-8991 Secondary Engine Air Filter for Cat 320 320 GC 323

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OEM / reference479-8991
SpecificationSecondary Engine Air Filter
Catalog ID91000018

Secondary standard-efficiency engine air-filter element identified by Cat part number 479-8991. The Cat 320/320 GC/323 parts reference guide pairs it with primary element 479-8989 for the published ZBN, DKJ and YBL machine families.

Product Type
Secondary Engine Air Filter
Filter Position
Secondary / safety element
Published Approximate Size
450 mm length x 125 mm OD; verify physical unit
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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Part-number relationships

RelationshipReference familyNumber
Primary Equipment Part NumberSecondary air filter479-8991
Paired Primary ElementPublished primary air filter479-8989

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.

Part identification

Reference numbers

Primary number
  • 479-8991
  • 479-8989

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

Secondary Engine Air Filter

Category
Excavator Filters
Catalog ID
91000018
Photo views
4

Before ordering

Confirm these details

  • Match the complete part number on the original component.
  • Compare connectors, mounting points and visible dimensions with the product photos.
  • Confirm the exact machine or engine model and serial range before ordering.

Machine fitment

Compatible model references

3 model references

  • Published equipment: Cat 320 / 320 GC / 323
  • Published serial prefixes: ZBN / DKJ / YBL
  • Fitment limitation: Confirm serial prefix and paired primary element

Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.

Quick fitment answers

Common questions about 479-8991

Which machines use 479-8991?

Recorded compatible model references include Published equipment: Cat 320 / 320 GC / 323, Published serial prefixes: ZBN / DKJ / YBL, Fitment limitation: Confirm serial prefix and paired primary element. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 479-8991?

No alternate number is listed for 479-8991. Send the original nameplate for an alternate-number check.

How do I confirm 479-8991 before ordering?

Match the complete part number on the original component. Compare connectors, mounting points and visible dimensions with the product photos. Confirm the exact machine or engine model and serial range before ordering. Send clear photos of the original unit and connector layout when requesting a quote.

Continue comparing verified references from the same system.

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