Skip to product information
Usually ships in 2–4 business days.
129327-42100 Water Pump for Yanmar 3D84 Komatsu PC20-5 PC20-6 PC30-5
$127.59
Sale price
$127.59
Regular price
Available to Order
This Water Pump is a replacement coolant pump compatible with Yanmar 3D84 engines and Komatsu PC20-5, PC20-6, PC30-5, PC30-6 excavators and matches OEM Part# 129327-42100.
Need help finding the right part? Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Product Overview
This water pump circulates coolant through Yanmar 3D84 and Komatsu PC series engines, preventing overheating and ensuring reliable operation. Designed as a direct replacement for part number 129327-42100, it restores proper cooling performance in compact excavators and industrial equipment. Perfect for equipment owners needing a durable, OEM-spec pump for their Yanmar- or Komatsu-powered machines.
Key Features & Performance
- Precision-engineered impeller delivers consistent coolant flow
- Mechanical seal prevents leaks and extends service life
- Direct fit replacement with OEM mounting points and gasket design
- Cast iron housing resists corrosion and thermal fatigue
- Each unit is vacuum-tested for zero defects
Fitment & Compatibility
- Yanmar 3D84 Engine
- Komatsu PC20-5 Excavator
- Komatsu PC20-6 Excavator
- Komatsu PC30-5 Excavator
- Komatsu PC30-6 Excavator
Common Uses
- Cooling system repair on Komatsu mini excavators
- Replacement water pump for Yanmar 3D84-powered generators
- Maintenance for agricultural tractors using Yanmar 3D84
- Overhaul of compact construction equipment cooling circuits
Technical Specifications
- Part Number(s): 129327-42100
- Pump Type: Centrifugal engine water pump
- Material: Cast iron housing, steel impeller
- Mounting Holes: 4-bolt pattern (see OEM for exact dimensions)
Frequently Asked Questions
Q: Is this water pump a direct replacement for the original? A: Yes, it matches the OEM part number and bolt pattern for a straightforward swap using existing gaskets.
Q: Does this pump come with a gasket or seal? A: No, the gasket and seal are sold separately; we recommend replacing them during installation.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.