Excavator Engine Parts

129120-01780 Rear Crankshaft Oil Seal for Yanmar 3TNE84 3TNE88 3TNV88 4TNV88

Q: What numbers are documented for 129120-01780?

Primary Manufacturer Part Number: 129120-01780. Direct Superseded Number: 129795-01780. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 129120-01780 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.

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OEM / reference129120-01780

SpecificationRear Crankshaft Oil Seal

Catalog ID84960423

129120-01780 is documented by Yanmar as the flywheel-housing/rear crankshaft oil seal and as the replacement for 129795-01780. Manufacturer and exact-number catalogs include 3TNE84, 3TNE88, 3TNV88 and numerous 4TNV88 variants. Confirm the complete number, 85 x 102 x 13 mm dimensional lead, sealing lip direction, flywheel-housing bore, engine suffix and serial before ordering.

Product Type: Rear Crankshaft Oil Seal
Published Dimensional Lead: 85 x 102 x 13 mm
Lip Orientation: Compare with original
Flywheel-Housing Bore: Confirm engine arrangement

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Part-number relationships

Relationship	Reference family	Number
Primary Manufacturer Part Number	Yanmar rear-seal reference	129120-01780
Direct Superseded Number	Official Yanmar replacement relationship	129795-01780

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

129120-01780

Direct interchange

129795-01780

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

Product summary

Rear Crankshaft Oil Seal

Category: Excavator Engine Parts
Catalog ID: 84960423
Photo views: 1

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

Engine families: Yanmar 3TNE84 / 3TNE88 / 3TNV88 / 4TNV88
Fitment limitation: Confirm number, dimensions, lip, housing, engine suffix and serial

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 129120-01780

Which machines use 129120-01780?

Recorded compatible model references include Engine families: Yanmar 3TNE84 / 3TNE88 / 3TNV88 / 4TNV88, Fitment limitation: Confirm number, dimensions, lip, housing, engine suffix and serial. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 129120-01780?

Documented direct interchanges: 129795-01780.

How do I confirm 129120-01780 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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