5 product photos · Select a thumbnail to change the main view.

Excavator Engine Parts

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

Name: 129120-01780 Rear Crankshaft Oil Seal for Yanmar 3TNE84 4TNV88
Brand: EexcavaStart
SKU: 129120-01780

OEM / reference129120-01780

SpecificationRear Crankshaft Oil Seal

Catalog ID84960423

Flywheel-end rear crankshaft oil seal identified by part number 129120-01780 for Yanmar 3TNE84, 3TNV82 and 4TNV88 engine families. Exact records identify 129795-01780 as the older part number. Confirm the engine suffix, shaft diameter and housing bore before ordering.

Fitment status: Verified · Checked 2026-07-28

Product Type: Rear Crankshaft Oil Seal
Product Brand: EexcavaStart
Installation Position: Crankshaft rear / flywheel end
Condition: New replacement part

Send email inquiry Ask on WhatsApp Return to catalog

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	Rear crankshaft oil seal	129120-01780
Formatted Alias	Same number without separator	12912001780
Superseded Part Number	Earlier Yanmar reference	129795-01780

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

129120-01780

Formatting alias

12912001780

Other documented relationship

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: 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

3 model references

Engine family: Yanmar 3TNE84 / 3TNV82
Engine family: Yanmar 4TNV88
Fitment limitation: Confirm engine suffix, shaft size and housing bore

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 family: Yanmar 3TNE84 / 3TNV82, Engine family: Yanmar 4TNV88, Fitment limitation: Confirm engine suffix, shaft size and housing bore. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 129120-01780?

Formatting aliases for the same number: 12912001780.

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 recovered references from the same system.

Browse this category