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Excavator Engine Parts

1A091-21054 Piston Ring Assembly for Kubota D1803 KX121 KX161

Name: 1A091-21054 Piston Ring Assembly for Kubota D1803 KX121 KX161
Brand: EexcavaStart
SKU: 1A091-21054

OEM / reference1A091-21054

SpecificationEngine Piston Ring Assembly

Catalog ID81075179

Piston-ring assembly identified by Kubota part number 1A091-21054 for D1803 engine applications. Dealer diagrams list KX121-3, KX161-3, KX91-3S2, U35-S2 and related machines and identify 1A091-21010 and 1A091-21050 as older numbers. Confirm engine suffix, piston diameter and serial range before ordering.

Fitment status: Verified · Checked 2026-07-28

Product Type: Engine Piston Ring Assembly
Product Brand: EexcavaStart
Engine Family: Kubota D1803
Condition: New replacement part

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Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Kubota piston-ring assembly	1A091-21054
Formatted Alias	Same number without separator	1A09121054
Superseded Part Number	Earlier Kubota reference	1A091-21010
Superseded Part Number	Earlier Kubota reference	1A091-21050

Evidence record

Source: Exact-reference evidence retained for internal audit
Evidence grade: manufacturer-supported
Checked: 2026-07-28

Source URLs, catalog files and local evidence paths are stored in the protected product audit record and are not public outbound links.

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

1A091-21054

Formatting alias

1A09121054

Other documented relationship

1A091-21010
1A091-21050

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

Product summary

Engine Piston Ring Assembly

Category: Excavator Engine Parts
Catalog ID: 81075179
Photo views: 5

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

4 model references

Engine family: Kubota D1803
Excavator: Kubota KX121-3 / KX161-3 / KX91-3S2
Excavator: Kubota U35-S2 / U45S
Fitment limitation: Confirm engine suffix, piston diameter and serial range

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 1A091-21054

Which machines use 1A091-21054?

Recorded compatible model references include Engine family: Kubota D1803, Excavator: Kubota KX121-3 / KX161-3 / KX91-3S2, Excavator: Kubota U35-S2 / U45S, Fitment limitation: Confirm engine suffix, piston diameter and serial range. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 1A091-21054?

Formatting aliases for the same number: 1A09121054.

How do I confirm 1A091-21054 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 recovered references from the same system.

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