Komatsu 6D125 Engine Main Bearing 6150-21-8010 for PC400-8 Excavator Crankshaft Bearing Replacement
The 6150-21-8010 main bearing is specifically designed for Komatsu 6D125 series diesel engines. Made of high-strength alloy and precision-machined, it offers excellent wear resistance and lubrication performance, ensuring stable operation under high temperature and high load conditions. Manufactured to OEM standard dimensions, it directly replaces genuine parts and is suitable for the repair and maintenance of Komatsu PC400 series engines.
Technical Parameters
| Cylinder diameter matching |
125mm |
| Material structure |
Multi-layer alloy |
| Material |
Multi-layer alloy bearing |
| Surface treatment |
Anti-wear coating, precision grinding |
| Lubrication method |
Oil lubrication, with oil holes/grooves |
| Cylinder compatibility |
6-cylinder engine |
| Quantity per machine |
14 pieces |
Features and Advantages
• Precise OEM Matching — Directly replaces original parts
• High Wear-Resistant Alloy — Multi-layer structure, strong fatigue resistance
• Optimized Lubrication — Oil hole and groove design, stable oil film
• High Load Capacity — Supports high temperature, high pressure, and heavy-duty conditions
• Extended Lifespan — Reduces friction and wear, protects the crankshaft
Product Showcase
6150-21-8010 Main Bearing 6D125 Engine (Actual Image) Komatsu S6D125 Crankshaft Bearing 6150-21-8010 (Suitable for PC400-8)

Guangzhou Minshun Machinery Equipment Co., Ltd.
We specialize in the sales and service of diesel engine assemblies and construction machinery parts. Our product line covers engine assemblies, filtration systems, electronic control components, hardware accessories, wiring harnesses, and electrical accessories. Our service area includes Canada, the United States, the United Kingdom, Mexico, the Netherlands, Kazakhstan, Mongolia, Russia, Australia, Malaysia, Turkey, Indonesia, Singapore, Thailand, South America, South Africa, and other countries and regions.
Our Product Range
| Engine Rebuild Kit |
Turbochargers |
Engine Diesel Pumps |
Engine Controllers (ECU) |
| Cylinder Blocks |
Cylinder Heads |
Water Pumps |
Injectors |
| Starter Motors |
Filters |
Other Engine Accessories |
Excavator Hydraulic Pumps |
| Swivel Components |
Distributor Valves |
Travel Motor Assemblies |
Chassis Components and Other Accessories |


Frequently Asked Questions
Q1: What is your main products?
A1: We are specialized in the excavator engine spare parts, for example Main cylinder block, cylinder head, crankshaft, Engine assembly, piston, cylinder liner, piston ring, camshaft, connecting rod, oil pump, water pump, valve series products, movement, etc. almost all parts of the entire engine.
Q2: Do you test all products before shipping?
A2: Yes, we conduct 100% testing before shipping.
Q3: Which engine models is this Main Bearing compatible with?
A3: This product is designed for specific diesel engine models. If you can provide the engine model or original part number, we can confirm compatibility before shipping to avoid incompatibility issues.
Q4: How to choose a bearing size?
A4: Choose a bearing size by matching the shaft and housing dimensions, load requirements, and operating conditions specified for your application.
Q5: What are the signs of a damaged main bearing?
A5: Common signs include abnormal engine noise, decreased oil pressure, or accelerated crankshaft wear.
Why Choose Us?
• Over 20 years of focus on construction machinery – offering a full range of excavator assemblies and accessories.
• Get a Quote – Our professional team will provide you with a quote immediately upon receiving your requirements.