C3976620 Eccentric Shaft for Cummins 6LT8.9 Engine | Excavator & Truck Parts

Product Details

Product Overview

This premium replacement eccentric shaft, identified by OEM number C3976620, is specifically engineered for the Cummins 6LT8.9 diesel engine platform. As a critical component within the engine’s valve train and fuel injection timing system, this shaft ensures precise rotational motion is converted into the linear movement required for optimal engine performance.

Manufactured to meet OEM dimensional and material specifications, this eccentric shaft is a direct-fit replacement designed to restore factory-level timing accuracy in Cummins 6LT series engines. It is commonly utilized in heavy-duty applications including excavators, loaders, trucks, and other industrial machinery where engine reliability is paramount.

Please verify your engine model (6LT8.9) and existing part number (C3976620) to confirm compatibility prior to installation.

Key Features & Benefits

• OEM Specification Fitment: Manufactured to match the exact dimensions, hardness, and surface finish of the original Cummins part, ensuring seamless installation and proper timing synchronization.
• Durable Material Construction: Crafted from high-strength alloy steel with precision-ground journal surfaces to withstand high cyclic loads and resist wear in demanding diesel engine environments.
• Precision Timing Assurance: The eccentric profile is machined to tight tolerances (±0.02mm) to maintain correct valve opening and closing events, directly impacting fuel efficiency and power output.
• Direct Replacement: Drop-in ready component with no modification required for 6LT8.9 applications. Simply remove the old shaft and install this unit using standard tools.
• Rigorous Quality Control: Each shaft undergoes dimensional inspection and hardness testing to ensure it meets the strict requirements of heavy-duty diesel operation.
• Cost-Effective Solution: Provides reliable aftermarket performance at a competitive price point compared to genuine OEM parts, reducing maintenance costs without compromising quality.
• Comprehensive Warranty: Backed by a 6-month warranty against manufacturing defects, offering peace of mind for fleet operators and equipment owners.

Technical Specifications

OEM Cross-Reference

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

• Cummins: C3976620 (Original Equipment Number)

Note: This part is designed to replace the genuine Cummins C3976620 eccentric shaft. Always verify your original part number before ordering.

Compatibility

This eccentric shaft is specifically designed for the Cummins 6LT8.9 diesel engine. It is commonly used in the following equipment applications:

• Excavators – Various models utilizing the 6LT8.9 power plant
• Forklifts – Heavy-duty material handling equipment
• Trucks – Medium-duty commercial vehicles
• Loaders & Bulldozers – Construction and earthmoving machinery
• Buses – Transit and coach applications

Fitment is inferred based on engine model. Please confirm your specific engine serial number and existing part number for guaranteed compatibility.

Global Supply & Distribution

We maintain extensive stock of the C3976620 eccentric shaft and offer reliable international shipping to all major markets. Our logistics network supports fast delivery to ports and industrial centers across:

• North America: Los Angeles, Houston, Chicago, Toronto, Vancouver
• Europe: Rotterdam, Hamburg, Antwerp, Felixstowe
• Asia-Pacific: Singapore, Shanghai, Tokyo, Sydney, Dubai
• Middle East & Africa: Jebel Ali, Jeddah, Durban, Lagos
• South America: Santos, Buenos Aires, Callao

With years of export experience and compliance with international trade regulations, we ensure your order is processed efficiently with proper documentation for customs clearance. Bulk orders and drop-shipping arrangements are welcome.

Quality Assurance

Our manufacturing process adheres to strict quality management standards. Each eccentric shaft is produced in an ISO-certified facility with the following quality controls:

• Material Certification: All raw materials are sourced from approved steel mills and verified for chemical composition.
• Dimensional Inspection: Every shaft is checked using CMM (Coordinate Measuring Machine) equipment to ensure OEM tolerances.
• Hardness Testing: Surface hardness is verified to meet the required Rockwell specification for wear resistance.
• Visual & Surface Finish Inspection: Journal surfaces are inspected for defects, scoring, or imperfections.
• Video Outgoing Inspection: Available upon request to provide visual confirmation of product condition before shipment.
• Machinery Test Report: Provided with each order to document compliance with specifications.
• Warranty Coverage: 6-month warranty against material or workmanship defects from the date of purchase.

FAQ

Q1: How do I confirm that this C3976620 eccentric shaft fits my Cummins 6LT8.9 engine?

Please verify your engine’s model number (stamped on the engine data plate) and the part number of the existing eccentric shaft. The C3976620 is designed exclusively for the 6LT8.9 platform. If your engine is a different variant (e.g., 6LTAA8.9) or you have a different part number, please contact us for cross-reference assistance before purchasing.

Q2: What are the common symptoms of a worn eccentric shaft in a 6LT8.9 engine?

A failing eccentric shaft can cause irregular valve timing, rough idling, loss of power, increased fuel consumption, and in severe cases, engine misfiring or difficulty starting. Visual inspection may reveal scoring, pitting, or wear on the shaft journals. If you experience any of these symptoms and suspect the eccentric shaft, we recommend replacing it with this OEM-spec component immediately to prevent further engine damage.

Q3: What is the recommended installation procedure for this eccentric shaft?

Installation should be performed by a qualified diesel mechanic. The general procedure involves: (1) Removing the timing cover and related components, (2) Marking the position of the old shaft for reference, (3) Carefully extracting the worn shaft, (4) Inspecting and cleaning the bore, (5) Lubricating the new shaft with clean engine oil, (6) Installing the new C3976620 shaft in the correct orientation, (7) Re-timing the engine according to the Cummins service manual, and (8) Reassembling all components. Always refer to the official Cummins 6LT8.9 service manual for torque specifications and timing procedures.