S6D125 6D125 Crankshaft Main Bearing 6150-21-8010 & Con Rod Bearing TW-2612K STD for Komatsu

Product Details

Product Overview

This listing offers a matched set of precision engine bearings specifically designed for the Komatsu S6D125 and 6D125 diesel engine platforms. The set includes the Crankshaft Main Bearing (Part No. 6150-21-8010) and the Connecting Rod Bearing (Part No. TW-2612K), both supplied in standard (STD) size. These components are critical for maintaining proper crankshaft and connecting rod clearances, ensuring optimal oil film thickness and reducing friction in high-output industrial engines.

These genuine-sourced parts are essential for engine overhauls and rebuilds on Komatsu excavators, bulldozers, and heavy-duty trucks. The 6D125 series is known for its reliability in demanding environments, and using the correct OEM-spec bearings is vital to prevent catastrophic engine failure. Please verify your engine model and existing bearing codes before ordering to ensure a correct fit for your specific application.

Key Features & Benefits

• OEM-Spec Precision: Manufactured to the exact dimensional tolerances required for the Komatsu 6D125/S6D125 engine block and crankshaft, ensuring a proper crush and spread for secure installation.
• Critical Component Set: Includes both main and rod bearings (6150-21-8010 & TW-2612K) for a comprehensive bottom-end rebuild, saving time on sourcing individual parts.
• Standard (STD) Size: Suitable for standard crankshaft journals and connecting rod bores that have not been machined undersized. Ideal for standard rebuild procedures.
• Reduced Friction & Wear: Advanced tri-metal or bi-metal lining material provides excellent embedability for contaminants and high load-carrying capacity, extending the life of the crankshaft.
• Authentic Sourcing: The condition is listed as genuine, providing confidence in the material quality and dimensional consistency critical for high-compression diesel engines.
• Long-Lasting Performance: Designed to withstand the high cyclic loads and thermal stress of excavator and truck operations, minimizing downtime for fleet operators.

Technical Specifications

OEM Cross-Reference

This set contains parts that directly cross-reference the following original equipment manufacturer (OEM) numbers for the Komatsu 6D125/S6D125 engine series:

• Crankshaft Main Bearing: 6150-21-8010
• Connecting Rod Bearing: TW-2612K

Note: These numbers may also be referenced by aftermarket bearing manufacturers like Clevite, King, or ACL for the same application. Always confirm your engine block casting number and journal measurements for absolute compatibility.

Compatibility

This bearing set is specifically designed for the Komatsu S6D125 and 6D125 diesel engines. These engines are commonly used for powering the following heavy equipment and vehicles:

• Excavators: Komatsu PC300, PC350, PC400 series
• Bulldozers: Komatsu D65, D85 series
• Trucks: Komatsu HD325, HD405 dump trucks

Fitment Verification: Compatibility is inferred based on the standard engine model designation. Due to variations in engine serial numbers and block revisions, we strongly recommend comparing the original bearing part numbers (6150-21-8010 or TW-2612K) with the parts being removed from your engine.

Global Supply & Distribution

We specialize in the export of genuine and heavy-duty engine components for the global construction and mining sectors. Our supply chain is optimized to serve international buyers with fast and reliable shipping.

• Major Markets Served: North America, Europe (EU), Southeast Asia, Middle East (GCC), Africa, and Oceania.
• Shipping Capabilities: We offer shipping via sea freight (FCL/LCL) to major ports (e.g., Rotterdam, Singapore, Houston, Dubai) and air freight for expedited orders.
• Industrial Centers: Our logistics network ensures quick delivery to inland industrial hubs and mining regions.
• Trade Compliance: We adhere to international export regulations and provide all necessary documentation (Packing List, Commercial Invoice, Certificate of Origin) for customs clearance.

Quality Assurance

We prioritize the integrity of internal engine components. While the warranty is limited to 3 months, the parts are sourced to meet stringent Japanese manufacturing standards for material hardness and dimensional accuracy.

• Inspection: Bearings are visually inspected for surface imperfections and packaging integrity before shipment.
• Material Standard: Designed to resist fatigue and corrosion from high-sulfur fuels common in global markets.
• After-Sales Support: We provide video technical support to assist with installation queries or part verification, ensuring you have the confidence to complete the job correctly.

FAQ

Q1: Are these bearings suitable for an engine that has been reground (undersized)?
No. These bearings are supplied in Standard (STD) size. They are intended for original factory-spec crankshaft journals. If your crankshaft has been reground, you will need to purchase undersized bearings (e.g., 0.25mm, 0.50mm) that match the specific grind of your shaft.

Q2: How do I verify if the 6150-21-8010 bearing is the correct one for my engine block?
First, check the part number stamped on the back of your old bearing. If it reads 6150-21-8010, this is a direct match. Second, measure the main bearing bore in your engine block using a bore gauge. The bearing crush and tang location must also match. We recommend consulting the Komatsu service manual for your specific engine serial number.

Q3: Do I need to replace both the main and rod bearings at the same time?
While it is best practice to replace all bearings during a major overhaul, these parts are sold as a set for convenience. If you are only repairing a specific rod failure, you can purchase the rod bearing separately. However, for balanced oil clearance and oil pressure, replacing the complete set of both main and rod bearings is highly recommended.