Product Overview

This is a genuine main bearing set engineered for Hitachi 4HK1 and 6HK1 diesel engines, commonly powering a range of Hitachi excavators. As a premier global supplier of heavy machinery engine components, we ensure this critical part meets the highest standards of precision and durability for demanding construction applications. We specialize in direct export to major industrial markets worldwide, including North America, Europe, the Middle East, and Asia-Pacific, ensuring reliable supply chains for B2B clients.

Key Features & Benefits

• Precision Engineering: Manufactured to exact OEM specifications for perfect fitment and optimal oil clearance, ensuring proper lubrication and engine longevity.
• Premium Material: Constructed from high-strength, wear-resistant alloy with a durable overlay for superior load-bearing capacity and fatigue resistance under extreme conditions.
• Optimal Performance: Maintains precise crankshaft alignment, reduces friction, and minimizes vibration for smooth engine operation and consistent power output.
• Extended Engine Life: Protects the crankshaft and engine block from premature wear, preventing costly downtime and major engine overhauls.
• Complete Set Supply: Sold as a matched set to ensure uniform performance across all main bearing journals.

Technical Specifications

OEM Cross-Reference

This main bearing set corresponds directly to the following OEM part numbers, ensuring full compatibility and performance equivalence.

• Hitachi: 8973720771
• Hitachi: 8973720761
• Isuzu: 8-94105679-1 (Cross-reference for 4HK1/6HK1 engine platform)

Compatibility

This main bearing set is designed for Hitachi excavators equipped with the Isuzu-sourced 4HK1 (4-cylinder) and 6HK1 (6-cylinder) turbocharged diesel engines. It is a critical component for engine rebuilds and major service intervals. Specific machine models include various Hitachi Zaxis series excavators (e.g., ZX200, ZX250, ZX330, ZX350) depending on the engine configuration. Please verify your engine serial number for exact application.

Global Supply & Distribution

We are a certified exporter with extensive experience in international logistics and trade compliance. Our streamlined supply chain enables fast and reliable shipping to all major global markets.

• Worldwide Shipping: We ship to North America (USA, Canada, Mexico), South America, Europe (EU & UK), Asia-Pacific (Australia, Singapore, Japan), the Middle East, and Africa.
• Efficient Logistics: Consolidated air and sea freight options to major ports and industrial hubs (e.g., Los Angeles, Rotterdam, Singapore, Dubai) for cost-effective delivery.
• B2B Focus: Dedicated support for wholesalers, distributors, and large-scale repair workshops, with flexible MOQs and Incoterms.

Quality Assurance

Every main bearing set undergoes rigorous quality control to ensure it meets or exceeds original equipment performance standards.

• Manufacturing Standards: Produced using ISO-certified processes with precise dimensional tolerances and material specifications.
• Pre-Shipment Inspection: Each part is visually and dimensionally checked to confirm it is free from defects and matches the specified part number.
• Warranty: Backed by a standard 12-month warranty against manufacturing defects, providing peace of mind for your investment.

FAQ

Q1: How do I confirm this main bearing set fits my specific Hitachi excavator?
A1: The most reliable method is to cross-reference the part number stamped on your old bearings or match your engine model and serial number. This set is specifically for the Isuzu 4HK1 and 6HK1 engine blocks used by Hitachi. Please contact our technical team with your machine model and engine S/N for verification.

Q2: Is this a complete set for a full engine rebuild?
A2: Yes, this listing is for a complete main bearing set, which includes all required upper and lower bearings for the crankshaft’s main journals. It is supplied as a matched set to ensure consistent performance.

Q3: What are the recommended installation procedures for these bearings?
A3: Professional installation is critical. Always clean all engine components thoroughly, verify oil clearance with Plastigage, ensure proper lubrication during assembly, and torque bolts to the engine manufacturer’s specified sequence and values. Incorrect installation can lead to immediate bearing failure.

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 .