Excavator Alternators

YM129240-77200 Komatsu Alternator for 3D84E-5N-BA

Q: What numbers are documented for YM129240-77200?

Primary Part Number: YM129240-77200. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm YM129240-77200 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.

Brand illustration · Exact product photo available on request.

OEM / referenceYM129240-77200

SpecificationAlternator

Catalog ID91001664

Catalog records classify YM129240-77200 as an Komatsu alternator for the applications shown below. The source set contains 8 supporting catalog rows. recorded engine references include 3D84E-5N-BA. Confirm the complete part number, electrical rating, terminals, mounting arrangement and machine serial range against the original unit before ordering.

Product Type: Alternator
Supply Brand: EexcavaStart
Equipment Brand: Komatsu
Catalog Classification: Alternator A. (40A),(See Fig.A6010-B0A1)
Application Records: 8
Condition: New replacement part
Gallery Representation: EexcavaStart neutral packaging illustration; exact product photo available on request

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

Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Exact identity retained from the supplied application catalog	YM129240-77200

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

YM129240-77200

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

Product summary

Alternator

Category: Excavator Alternators
Catalog ID: 91001664
Photo views: 1

Before ordering

Confirm these details

Confirm voltage and rated amperage against the original alternator label.
Compare mounting ears, pulley type and pulley-groove count.
Check plug shape, terminal position and regulator connection.
Verify the engine model and machine serial range before ordering.

Machine fitment

Compatible model references

2 model references

Engine models: 3D84E-5N-BA
Fitment limitation: Confirm the exact part number, electrical rating, terminal layout, mounting and machine serial range before shipment

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 YM129240-77200

Which machines use YM129240-77200?

Recorded compatible model references include Engine models: 3D84E-5N-BA, Fitment limitation: Confirm the exact part number, electrical rating, terminal layout, mounting and machine serial range before shipment. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for YM129240-77200?

No alternate number is listed for YM129240-77200. Send the original nameplate for an alternate-number check.

How do I confirm YM129240-77200 before ordering?

Confirm voltage and rated amperage against the original alternator label. Compare mounting ears, pulley type and pulley-groove count. Check plug shape, terminal position and regulator connection. Send clear photos of the original unit and connector layout when requesting a quote.