Part-number relationships
| Relationship | Reference family | Number |
|---|---|---|
| Primary Equipment Part Number | Yanmar X4 injection-pump head/rotor assembly | 129602-51741 |
| Pump Head Designation | Stamped/catalog designation; not an interchange number | X4 |
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Excavator Engine Parts
X4 fuel-injection-pump head/rotor assembly identified by Yanmar reference 129602-51741. Exact-number fuel-system catalogs record this pump head for 4D88, 4TNE88, 4TNV84 and 4TNV88 engine families, including Yanmar Vio45/Vio55 and Kobelco SK45SR applications. Confirm the stamped X4 designation, port arrangement, governor-side configuration and injection-pump model before ordering.
Fitment status: Verified · Checked 2026-07-28Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
| Relationship | Reference family | Number |
|---|---|---|
| Primary Equipment Part Number | Yanmar X4 injection-pump head/rotor assembly | 129602-51741 |
| Pump Head Designation | Stamped/catalog designation; not an interchange number | X4 |
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Product fitment guide
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.
Product summary
Before ordering
Machine fitment
4 model references
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
Recorded compatible model references include Engine: Yanmar 4D88 / 4TNE88 / 4TNV84 / 4TNV88, Recorded machine model: Yanmar Vio45 / Vio55, Recorded machine model: Kobelco SK45SR, Fitment limitation: Confirm X4 marking, port arrangement, governor-side configuration and injection-pump model. Confirm the complete part number and machine serial range before ordering.
129602-51741 is the only classified number in the current evidence record. Send the original nameplate for an alternate-number check.
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.