Product Overview

This is a high-performance main bearing set engineered for Komatsu excavators powered by the J08E diesel engine. Designed for durability under extreme loads, this critical component ensures smooth crankshaft operation and long-term engine reliability. We supply this part globally, with extensive experience serving major industrial markets across North America, Europe, Asia-Pacific, and the Middle East.

Key Features & Benefits

• Premium Material Construction: Manufactured from high-grade, wear-resistant alloys to withstand the high-pressure and high-temperature environment of a heavy-duty diesel engine.
• Precision Engineering: Exact OEM specifications ensure perfect fitment, correct oil clearance, and optimal oil flow for maximum lubrication and reduced friction.
• Enhanced Durability: Extends engine life by providing robust support for the crankshaft, minimizing wear on both the crankshaft journals and the engine block.
• Optimal Engine Performance: Maintains proper crankshaft alignment, which is crucial for smooth power delivery, reduced vibration, and preventing catastrophic engine failure.
• Cost-Effective Maintenance Solution: A reliable aftermarket alternative that delivers OEM-level performance, helping to reduce downtime and maintenance costs for your heavy machinery fleet.

Technical Specifications

OEM Cross-Reference

This part is a direct replacement for the following OEM part numbers:

• Komatsu: S1170-12140
• This part number is specific to the J08E engine application in the listed machine models. Always verify your engine serial number for absolute compatibility.

Compatibility

This main bearing set is specifically designed for the following applications:

• Engine: Komatsu J08E Diesel Engine.
• Machinery: Komatsu SK330-8 Hydraulic Excavator, Komatsu S350-8 Hydraulic Excavator.
• Typical Model Years: Applicable to production years corresponding with the SK330-8 and S350-8 series. Please consult your service manual or contact us with your machine serial number for precise confirmation.

Global Supply & Distribution

We are a trusted global supplier for heavy equipment parts, ensuring reliable delivery to workshops and job sites worldwide.

• Worldwide Shipping: We export via air and sea freight to all major continents, including North America (USA, Canada, Mexico), South America, Europe (EU, UK), Asia-Pacific (Australia, Southeast Asia), the Middle East, and Africa.
• Fast Logistics: Efficient shipping from our warehouses to key international hubs such as Rotterdam, Los Angeles, Singapore, Dubai, and Sydney.
• Export Expertise: All documentation, including commercial invoices, packing lists, and certificates of origin, is provided for smooth customs clearance in compliance with international trade regulations.
• B2B Focus: We specialize in bulk orders for machinery dealers, repair workshops, and mining/construction companies, offering competitive FOB and CIF terms.

Quality Assurance

• Manufacturing Standards: Produced in ISO-certified facilities using advanced machining and quality control processes to meet or exceed original dimensional and performance specifications.
• Rigorous Testing: Each bearing set undergoes dimensional accuracy checks, surface finish analysis, and material composition verification.
• Warranty: Backed by a standard warranty against manufacturing defects. Specific warranty terms are provided with the commercial invoice.
• Certification: Materials are sourced from certified suppliers, and production follows strict industry standards for aftermarket engine components.

FAQ

Q1: How do I confirm this main bearing set is the correct part for my Komatsu excavator?
A1: The primary identifiers are your machine model (SK330-8 or S350-8) and your engine model (J08E). For absolute certainty, we recommend providing your machine’s serial number (S/N) or the engine serial number. This allows us to cross-reference the exact production specifications.

Q2: Is this a full set of main bearings for the J08E engine?
A2: Yes, this part number (S1170-12140) refers to the complete set of main bearings required for a standard overhaul of the J08E engine crankshaft. It includes all necessary bearings for the main journals.

Q3: What are the critical installation checks for these main bearings?
A3: Professional installation is crucial. Key steps include: 1) Verifying the crankshaft journal dimensions and condition, 2) Checking bearing clearance with Plastigage or micrometers as per the service manual, 3) Ensuring the bearing shells are clean and properly seated in their saddles, and 4) Torquing the main bearing caps to the manufacturer’s specified sequence and value with proper 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 .