Excavator Engine Parts

129001-02931 Main Bearing Set for Yanmar 4JH Series

Q: What numbers are documented for 129001-02931?

Primary Yanmar Part Number: 129001-02931. Undersize Main-Bearing Reference: 129150-02871. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 129001-02931 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

129001-02931 Main Bearing Set for Yanmar 4JH Series, OEM/reference 129001-02931, Main Bearing Set, product view 1

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OEM / reference129001-02931

SpecificationMain Bearing Set

Catalog ID87372795

Product Type: Main bearing set
Catalog Description: METAL ASSY, MAIN
Catalog Quantity: 5 per published engine assembly
Bearing Grade: Standard; verify crankshaft journal before ordering
Condition: New replacement part

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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Quotation details: MOQ, availability, lead time, item condition (new or remanufactured) and warranty coverage must be confirmed in your quotation before ordering.

Part-number relationships

Relationship	Reference family	Number
Primary Yanmar Part Number	Cataloged standard main-bearing metal assembly	129001-02931
Undersize Main-Bearing Reference	Separate 0.25 undersize catalog item; not a direct interchange	129150-02871

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

129001-02931

Other documented relationship

129150-02871

Formatting aliases are the same number written differently. Cross-references require a specification and fitment check; they do not by themselves confirm direct interchangeability. Related assemblies and remanufactured numbers are separate relationship types.

Product summary

Main Bearing Set

Category: Excavator Engine Parts
Catalog ID: 87372795
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

2 model references

Yanmar 4JH Examples: 4JH4-HTE1 / 4JH57 / 4JH110 and related cataloged variants
Catalog Position: Cylinder block / crankshaft main-bearing location

Fitment / evidence notes

Fitment Limitation: Confirm 129001-02931, engine suffix, bearing grade, crankshaft dimensions 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 129001-02931

Which machines use 129001-02931?

Recorded compatible model references include Yanmar 4JH Examples: 4JH4-HTE1 / 4JH57 / 4JH110 and related cataloged variants, Catalog Position: Cylinder block / crankshaft main-bearing location. Recorded fitment/evidence notes: Fitment Limitation: Confirm 129001-02931, engine suffix, bearing grade, crankshaft dimensions and serial range. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 129001-02931?

No alternate number is listed for 129001-02931. Send the original nameplate for an alternate-number check.

How do I confirm 129001-02931 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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