Skip to product information
SKU:
NLT2T00511
Ships for free in 2–4 business days.
Water Pump 129004-42001 for Yanmar 4TNV84 4TNV88 Engines / Komatsu PC50
$166.49
In Stock
$166.49
Sale price
$166.49
Regular price
This is a replacement engine water pump for Yanmar 4TNV84 and 4TNV88 diesel engines, including applications used in certain Komatsu PC50 excavators. Match part number 129004-42001 and your existing pump before ordering.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
| Engine | Yanmar 4TNV84, 4TNV84-GGE, 4TNV88 |
|---|---|
| Equipment | Certain Komatsu PC50 excavator applications using the matching Yanmar engine/pump configuration |
Product Overview
A worn water pump can show up as coolant seepage, bearing noise, overheating, or inconsistent coolant circulation. This pump is intended to restore normal coolant flow through compatible Yanmar 4TNV84/4TNV88 cooling systems so the engine can hold a stable operating temperature under load.
The 129004-42001 pump family is also commonly cross-referenced with YM129004-42001 and related Yanmar pump numbers including 129508-42001 and 129100-42002/42004. Because these engines appear in more than one equipment installation, compare the housing, pulley/fan mounting arrangement and hose connections with the pump being removed.
Key Features & Performance
- Restores coolant circulation through the engine and radiator circuit
- Useful replacement when the original pump leaks, develops shaft play or becomes noisy
- Direct application for Yanmar 4TNV84 and 4TNV88 engine families
- Multiple Yanmar cross-reference numbers make part-number matching easier
Specifications & Reference Numbers
- Primary reference: 129004-42001 / YM129004-42001
- Common cross references: 129508-42001, 129100-42002, 129100-42004
- Part type: Engine water pump
Before You Order
Verify the stamped/cast part number and compare the pump housing, hub and hose-port layout. Komatsu model alone is not enough because engine and serial-number configurations can vary.
Frequently Asked Questions
What should I use as the final fitment check? Use the listed part/reference numbers, your exact engine or machine model, and the physical configuration of the part being replaced. Serial-number and production changes can matter.
What are common reasons to replace this part? A worn water pump can show up as coolant seepage, bearing noise, overheating, or inconsistent coolant circulation. This pump is intended to restore normal coolant flow through compatible Yanmar 4TNV84/4TNV88 cooling systems so the engine can hold a stable operating temperature under load.