QSM11 Rocker Arm 4003912 for Cummins Engine Parts Excavator Truck

Product Details

Product Overview

This high-quality rocker arm, identified by part number 4003912, is a critical component designed for the Cummins QSM11 diesel engine. As a precision-engineered part, the rocker arm is responsible for transferring the camshaft’s motion to the engine valves, ensuring proper valve timing and optimal combustion efficiency.

Manufactured to OEM size standards, this rocker arm is a direct replacement part, commonly used in a wide range of heavy-duty equipment. Its applications are extensive, including but not limited to excavators, bulldozers, trucks, buses, loaders, and forklifts. This part is essential for maintaining the performance and reliability of your Cummins-powered machinery in demanding work environments.

While this part is a direct fit for the QSM11 model, we always recommend verifying your engine’s specific configuration and part number cross-reference to ensure a perfect match for your application.

Key Features & Benefits

• Precise Fitment: Manufactured to OEM specifications (OEM Size) for the Cummins QSM11 engine, ensuring a direct bolt-on replacement without modifications.
• Durable Construction: Built from high-strength materials to withstand the extreme pressures and high-cycle fatigue common in diesel engine valve trains.
• Enhanced Engine Performance: Restores proper valve lift and timing, leading to improved fuel efficiency, reduced emissions, and restored engine power.
• Rigorous Quality Control: Each unit undergoes a Machinery Test Report and Video Outgoing Inspection to verify dimensional accuracy and operational integrity before shipping.
• Reliable Warranty: Backed by a standard 6-month warranty, providing peace of mind for your investment and operational uptime.
• Versatile Application: Suitable for a diverse range of heavy equipment, from construction vehicles like excavators and loaders to on-highway trucks and industrial machinery.
• Easy Identification: Laser-etched part number (4003912) for quick and easy identification during installation or inventory management.

Technical Specifications

OEM Cross-Reference

This rocker arm is a direct replacement for the following OEM part numbers. Please use this list to verify compatibility with your existing part.

• 4003912 (Primary Part Number)
• 3100110 (Alternative / Cross-Reference)

Note: If your original part number is not listed, please contact us with your engine serial number for further cross-referencing assistance.

Compatibility

This rocker arm is specifically designed for the Cummins QSM11 diesel engine platform. It is commonly used for the following equipment types:

• Excavators
• Bulldozers
• Wheel Loaders
• Heavy-Duty Trucks
• Buses & Coaches
• Forklifts
• Agricultural & Industrial Machinery

Fitment is inferred based on the engine model. Always confirm the specific engine configuration and valve train design of your machine before purchase.

Global Supply & Distribution

We are committed to providing seamless global logistics for our B2B clients. Our distribution network supports efficient shipping to major industrial centers worldwide, including North America, Europe, the Middle East, Southeast Asia, and South America.

We offer flexible shipping options via sea freight (FOB, CIF), air freight, and express couriers (DHL, FedEx, UPS) to meet your delivery deadlines. Our export team has extensive experience in international trade documentation, ensuring fast customs clearance at major ports like Los Angeles, Rotterdam, Dubai, and Shanghai.

Whether you need a single part for a critical repair or bulk quantities for a fleet maintenance program, we can tailor a supply solution to fit your operational needs.

Quality Assurance

Every rocker arm is manufactured in an ISO-compliant facility, ensuring consistent quality and adherence to international standards. Our quality control process includes:

• Incoming Material Inspection: Raw materials are tested for metallurgical composition and hardness.
• In-Process QC: Dimensional checks are performed during machining to ensure tolerances are maintained.
• Final Inspection: Each unit is visually inspected and functionally tested. A Machinery Test Report is provided to confirm operational integrity.
• Outgoing Inspection: We provide Video Outgoing Inspection upon request, allowing you to visually verify the product before shipment.

We stand behind the quality of our parts with a standard 6-month warranty against manufacturing defects.

FAQ

Q1: Is this rocker arm a direct replacement for the OEM Cummins part?
Yes, this part (4003912) is manufactured to OEM specifications and is a direct replacement for the original Cummins rocker arm used on the QSM11 engine. It is designed to be a bolt-on component with no modifications required.

Q2: What are the signs of a failing rocker arm, and how do I know I need to replace it?
Common signs include a loud ticking or tapping noise from the valve cover area, reduced engine power, rough idling, or poor fuel economy. You may also notice uneven wear on the valve stem tips. If you suspect a failure, we recommend inspecting the rocker arm for excessive play, scoring, or cracks.

Q3: Do I need to replace any other parts when installing a new rocker arm?
It is highly recommended to replace the rocker arm shaft, bushings, and valve lash adjusters (if applicable) simultaneously to ensure even wear and proper system geometry. Additionally, you should replace the valve cover gasket during reassembly. Always follow the engine manufacturer’s service manual for specific torque specifications and valve lash adjustment procedures.