Caterpillar Mitsubishi 3066 S6K S6KT Forged Steel Crankshaft 5i7671 34320-10011

Product Details

Product Overview

This premium forged steel crankshaft is a direct replacement for Caterpillar 3066 and Mitsubishi S6K / S6KT diesel engines. Manufactured to meet or exceed OEM specifications, this component is essential for engine rebuilds and overhauls. We supply this critical engine part globally, serving major markets in North America, Europe, Southeast Asia, the Middle East, and Africa, ensuring fast shipping to industrial hubs and ports.

Key Features & Benefits

• Superior Strength: Constructed from high-quality forged steel for exceptional durability and resistance to torsional stress and fatigue.
• Precision Engineering: Machined to tight tolerances for a perfect fit and optimal engine balance, reducing vibration and wear.
• Induction Hardened: Journal surfaces are induction hardened and precision ground for maximum wear resistance and long service life.
• Direct OEM Replacement: Designed as a direct bolt-in replacement for original equipment parts, ensuring a seamless installation.
• Enhanced Performance: Restores engine performance, power output, and reliability in heavy-duty applications.

Technical Specifications

OEM Cross-Reference

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

• Caterpillar: 5i7671
• Mitsubishi: 34320-10011, 34320-00010

Compatibility

This forged steel crankshaft is specifically designed for use in the following engine platforms:

• Caterpillar: 3066 Engine
• Mitsubishi: S6K, S6KT Engines

Commonly used in heavy machinery such as Caterpillar excavators (e.g., 320, 325 series), bulldozers, and various industrial and marine applications powered by these engine models.

Global Supply & Distribution

Our supply chain is optimized for international B2B buyers. We offer:

• Worldwide Shipping: Reliable logistics partners for shipping to over 50 countries.
• Major Markets: Consistent supply to North America, Europe, Asia-Pacific, the Middle East, and Africa.
• Fast Delivery: Express shipping options available to major industrial ports and distribution centers.
• Trade Compliance: Experienced in international export documentation and customs clearance.

Quality Assurance

We prioritize quality to ensure the longevity and reliability of your engine rebuild.

• Manufacturing Standards: Produced in ISO 9001 certified facilities under strict quality control.
• Testing: Each crankshaft undergoes rigorous inspection for dimensional accuracy, hardness, and material integrity.
• Warranty: Backed by a comprehensive warranty against manufacturing defects.

FAQ

1. Will this crankshaft fit my Mitsubishi S6K engine in a Caterpillar 320 excavator?
Yes, this crankshaft is a direct cross-reference for the Mitsubishi S6K and S6KT engines, which are commonly installed in Caterpillar 3066 series machines, including the 320 excavator. Please verify your engine model and existing part number (5i7671 or 34320-10011) to ensure fitment.

2. What is the difference between a cast iron and a forged steel crankshaft?
Forged steel crankshafts, like this one, are significantly stronger and more durable than cast iron counterparts. The forging process aligns the metal’s grain structure, providing superior resistance to bending and torsional fatigue. This makes forged steel the preferred choice for high-stress applications, turbocharged engines, and rebuilds requiring maximum reliability.

3. Do I need to replace the main bearings and thrust washers when installing a new crankshaft?
Yes, it is strongly recommended to install new main bearings, connecting rod bearings, and thrust washers when replacing a crankshaft. This ensures proper oil clearance and surface mating for the new component, preventing premature wear and potential engine failure. Always follow the manufacturer’s service manual for torque specifications and assembly procedures.