Caterpillar S6K Crankshaft 5I-7670 for CAT 320 Excavator

Powering the Legend: Forged Crankshafts for CAT 320 Series Excavators

The Caterpillar 320 series is arguably the most ubiquitous excavator in the construction world, and the S6K engine is its reliable heart. Ruich Value supplies precision-forged S6K crankshafts designed to maintain the uptime of these legendary machines. Unlike general-purpose engine parts, our components are specifically validated for the heavy-duty digging cycles of the CAT 320, 320L, and E200B.

This forged steel crankshaft (OEM 5I-7670) serves as a direct upgrade for high-hour engines requiring a bottom-end rebuild. We have addressed the specific torsional vibration challenges of the inline 6-cylinder S6K design by implementing deep-fillet induction hardening. This ensures that whether you are running a vintage E200B or a workhorse 320L, your engine retains the smooth power delivery and structural integrity that defined an era of Caterpillar engineering.

Technical Specifications for CAT S6K Forged Crankshaft

Technician’s Note: Installation & Inspection

Technician’s Note: The Caterpillar S6K engine shares its architecture with the Mitsubishi 6D14. While the crankshafts are largely interchangeable, it is critical to verify the number of bolt holes on the flywheel flange and the nose pulley keyway configuration before installation. Using the wrong variant can lead to vibration issues and driveline misalignment.

Verified CAT S6K & Mitsubishi Equipment Applications

Why Source Heavy Duty Parts From Ruich Value?

• Forged Strength: We strictly use forged steel production for S6K crankshafts to ensure they can withstand the shock loads of hydraulic excavator duty, superior to cast iron alternatives.
• Precision Grinding: CNC grinding ensures journal tolerances are within OEM specifications, guaranteeing proper oil pressure and bearing life.
• Dual-Market Expertise: Our knowledge of both Caterpillar and Mitsubishi interchanges ensures you get the correct part for your specific machine model.
• Secure Logistics: Packaged in reinforced wooden crates with anti-rust protection to withstand long-distance shipping and site storage.

Complete Caterpillar Crankshaft Catalog

Ruich Value supports the maintenance of global heavy infrastructure with a complete line of Industrial Diesel Engine Components. From the versatile S6K to the heavy-lift C15, our crankshaft catalog covers the prime movers of your fleet.

Category coverage: Our inventory includes forged crankshafts for CAT 3306, 3304, S4K, 3066, C6.4, C7, C9, and C15 series engines.

View all specs in our Industrial Diesel Engine Components Crankshaft Catalog.

Or explore the complete Caterpillar Industrial Diesel Engine Components Range

Technical FAQ: Caterpillar S6K Crankshaft

Q: Is this crankshaft compatible with Mitsubishi 6D14 engines?

A: Yes, the Caterpillar S6K is based on the Mitsubishi 6D14 design. The Ruich Value replacement for 5I-7670 is generally compatible with 6D14 applications (OEM ME032130). However, due to various application specs (truck vs. excavator), please provide your engine serial number or original crankshaft dimensions for final verification.

Q: Does Ruich Value supply matching bearings for the S6K?

A: Yes, we supply high-quality tri-metal main and rod bearings to match our S6K crankshafts. We offer both standard (STD) sizes and undersize options (0.25mm, 0.50mm) if you are regrinding an old unit, though we recommend a new forged crankshaft for reliability.

Q: What is the material difference between S6K and S6KT crankshafts?

A: Both naturally aspirated (S6K) and turbocharged (S6KT) versions require high strength. Ruich Value supplies Forged Steel crankshafts for all S6K applications to handle the increased cylinder pressure of turbo variants and ensure maximum fatigue life.

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Customized/billet crankshaft development based on drawings or samples is also possible.

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