Product Overview

This Daido M4450 main bearing is a genuine OEM component engineered for the Komatsu 6UZ1 engine series. Designed for durability and precise fitment, it is a critical part for maintaining engine integrity and performance in demanding excavator applications. We specialize in the global supply of high-quality engine parts, serving major industrial markets worldwide with reliable shipping and expert B2B support.

Key Features & Benefits

• Genuine OEM Quality: Manufactured by Daido to exact Komatsu specifications, ensuring perfect fit and optimal performance.
• Extended Service Life: Engineered for superior wear resistance and durability under high-load conditions, reducing downtime.
• Precision Engineering: Guarantees proper oil clearance and crankshaft support for smooth engine operation and power output.
• Reliable Performance: Helps maintain engine compression and longevity, protecting your valuable equipment investment.
• Global Availability: Supported by our international logistics network for fast delivery to job sites and workshops worldwide.

Technical Specifications

OEM Cross-Reference

This genuine Daido bearing corresponds directly to the following Komatsu part number:

• Komatsu: M4450

Note: Always verify part numbers against your engine’s serial number or existing components for exact compatibility.

Compatibility

This main bearing is specifically designed for the Komatsu 6UZ1 diesel engine. This engine is commonly found in various Komatsu excavator models. For precise application, we recommend consulting your equipment’s service manual or contacting our technical support with your machine’s model and serial number.

• Primary Application: Komatsu Excavators equipped with the 6UZ1 engine.

Global Supply & Distribution

We are a trusted partner for heavy equipment parts distributors and repair workshops across the globe. Our streamlined export process ensures reliable delivery to key markets:

• Major Markets Served: North America, Europe, Asia-Pacific, Middle East, Africa, and South America.
• Efficient Logistics: We ship via air and sea freight to major ports and industrial hubs, offering competitive landed costs.
• Export Expertise: All documentation (commercial invoice, packing list, certificate of origin) is provided for smooth customs clearance worldwide.
• B2B Focus: We support bulk orders and establish long-term supply agreements to meet your inventory needs.

Quality Assurance

Every part we supply meets the highest standards of quality and authenticity.

• Manufacturing Standard: Produced in Japan by Daido Metal Co., Ltd., a leading OEM supplier to Komatsu, adhering to strict JIS (Japanese Industrial Standards).
• Genuine Guarantee: We supply only authentic OEM components, not aftermarket imitations.
• Warranty: Backed by a 3-month warranty against manufacturing defects.
• Post-Warranty Support: Access to video technical support for installation guidance.

FAQ

Q: How can I confirm this M4450 bearing fits my specific Komatsu excavator?
A: The most reliable method is to cross-reference the part number from your machine’s official service parts book or provide us with your equipment’s complete model and serial number. The 6UZ1 engine was used in several excavator chassis models over different years.

Q: Is this a full set of main bearings for the 6UZ1 engine?
A> This listing is for a single main bearing (part number M4450). A complete engine rebuild typically requires a full set of main bearings. Please contact us to inquire about purchasing a complete bearing kit for the 6UZ1 engine.

Q: What are the critical installation checks for this main bearing?
A> Proper installation is crucial. Always check the specified oil clearance with a plastigage, ensure the bearing saddle and cap are clean and undamaged, and torque the main cap bolts to the manufacturer’s specification in the correct sequence. Using the correct engine oil is also essential for initial lubrication.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .