Cummins 4BT3.9 6BT5.9 Oil Delivery Pump 3904574 3904374 for Excavator & Truck Engine Parts

Product Details

Product Overview

This high-quality Oil Delivery Pump is a direct replacement component engineered for the Cummins 4BT3.9 and 6BT5.9 diesel engine families. Designed to provide a consistent and reliable supply of fuel to the injection system, this pump is critical for maintaining optimal engine performance, fuel efficiency, and longevity in heavy-duty applications.

Identified by the OEM part numbers 3904574 and 3904374, this fuel transfer pump is commonly used in a wide range of industrial and construction machinery. Whether you are maintaining a forklift, excavator, truck, loader, bulldozer, or bus, this part ensures your Cummins B-series engine receives the precise fuel delivery required for demanding work cycles.

Manufactured to OEM size specifications, this unit offers a seamless fit and direct bolt-on installation for qualified engines, making it an ideal solution for fleet maintenance, equipment rebuilds, and spare parts inventory.

Key Features & Benefits

• Precise OEM Fitment: Manufactured to strict OEM size standards (3904574 / 3904374) to ensure a direct, bolt-on replacement without modifications.
• Reliable Fuel Delivery: Ensures consistent fuel pressure and volume to the injection system, preventing power loss, misfiring, and hard starting.
• Durable Construction: Built with robust materials to withstand the high-vibration and high-temperature environments typical of diesel engines in construction and industrial equipment.
• Extended Service Life: Designed for long-term durability, reducing downtime and maintenance costs for your fleet.
• Versatile Application: Compatible with both 4BT3.9 (4-cylinder) and 6BT5.9 (6-cylinder) engine platforms, simplifying inventory management.
• Rigorous Testing: Each unit undergoes outgoing inspection and machinery test reports to verify performance before shipment.

Technical Specifications

OEM Cross-Reference

This oil delivery pump is a direct replacement for the following original equipment manufacturer (OEM) part numbers:

• Cummins OEM: 3904574, 3904374

Note: While these are the primary cross-references, this part may also substitute for other variations of the fuel transfer pump used in the 4BT3.9 and 6BT5.9 engine series. Please verify your specific engine configuration.

Compatibility

This part is designed for use with the following Cummins B-series diesel engines:

• Engine Models: 4BT3.9 (4-cylinder), 6BT5.9 (6-cylinder)

It is commonly used for the following equipment applications:

• Forklifts
• Excavators
• Trucks (Medium-duty)
• Wheel Loaders
• Bulldozers
• Buses
• Agricultural tractors
• Generator sets (GenSets)

Note: Fitment is inferred based on the engine model. Always verify the part number and engine configuration before installation.

Global Supply & Distribution

We are a dedicated exporter of heavy-duty diesel engine parts, serving a global network of B2B clients. Our supply chain is designed for efficiency and speed, ensuring your operations stay productive.

• Worldwide Shipping: We ship to all major continents including North America, South America, Europe, Asia-Pacific, Africa, and the Middle East.
• Fast Logistics: Reliable delivery to major ports and industrial centers via sea, air, and express courier services (DHL, FedEx, UPS).
• Major Markets: Strong distribution presence in the USA, Canada, UK, Germany, Australia, UAE, Saudi Arabia, and Southeast Asia.
• Trade Compliance: Experienced in international trade documentation, customs clearance, and export procedures.

Quality Assurance

We prioritize quality to ensure your machinery operates at peak performance. Our quality management process includes:

• Manufacturing Standards: Parts are produced in ISO-certified facilities using high-grade materials.
• Testing: Each pump undergoes a Machinery Test Report and Video Outgoing Inspection to verify function and pressure standards.
• Warranty: Backed by a 6-month warranty against manufacturing defects, providing peace of mind for your investment.
• Packaging: Securely packed in plastic bags, boxes, and cartons to prevent damage during transit.

FAQ

Q1: How do I verify if this pump (3904574) fits my engine?
A: Check the serial plate on your current pump. If the OEM number is 3904574 or 3904374, it is a direct match. Additionally, if your engine is a Cummins 4BT3.9 or 6BT5.9, this pump is the correct specification. We recommend cross-referencing your engine’s serial number with the OEM parts catalog for absolute certainty.

Q2: What are the signs of a failing oil delivery pump on a 6BT5.9 engine?
A: Common symptoms include difficulty starting the engine, engine stalling, loss of power under load, excessive black smoke from the exhaust, and unusual noise (whining or chattering) from the pump area. A fuel pressure test is the best way to diagnose a weak pump.

Q3: What maintenance is required for this fuel transfer pump?
A: This is a mechanical pump and generally requires no routine maintenance beyond keeping the fuel system clean. Ensure your fuel filters are changed regularly per the engine manufacturer’s schedule (typically every 250-500 hours). Contaminated fuel is the primary cause of pump failure. Always bleed the fuel system after installation to remove air pockets.