4003950
Lubricating Oil Pump
Cummins®

The Cummins 4003950 Lubricating Oil Pump is a critical component in the engine system of commercial trucks. Its purpose is to circulate lubricating oil throughout the engine, ensuring that all moving parts are adequately coated to reduce friction and wear. This pump is significant in maintaining the overall health and efficiency of the engine, contributing to the longevity and performance of the truck.

Function and Operation of Lubricating Oil Pumps

Lubricating oil pumps operate on the principle of transferring oil from the oil pan to various engine components under pressure. They typically use a gear, rotor, or plunger mechanism to create a flow of oil that is then distributed through passages and galleries within the engine block and cylinder heads. This process plays a role in maintaining engine health by ensuring that critical components such as bearings, pistons, and camshafts receive a continuous supply of lubricant ¹.

Role of the 4003950 Lubricating Oil Pump in Truck Operation

The Cummins 4003950 Lubricating Oil Pump plays a specific role in the operation of a commercial truck by providing consistent and reliable oil circulation. This pump contributes to engine lubrication by ensuring that oil reaches all necessary parts, which helps in reducing friction and heat. Its performance directly influences the engine’s efficiency and durability, making it a key component in the truck’s operation ².

Key Features of the 4003950 Lubricating Oil Pump

The Cummins 4003950 Lubricating Oil Pump is designed with several features that enhance its functionality and reliability. Constructed from high-quality materials, this pump is built to withstand the demanding conditions of commercial truck engines. Its design includes precision-machined components to ensure accurate oil flow and minimal leakage. Additionally, the pump may feature unique characteristics such as an integrated relief valve to maintain optimal oil pressure.

Benefits of Using the 4003950 Lubricating Oil Pump

Utilizing the Cummins 4003950 Lubricating Oil Pump offers several advantages. These include improved engine efficiency due to effective lubrication, reduced wear and tear on engine components, and enhanced reliability of the engine system. The pump’s design and construction contribute to these benefits by ensuring consistent oil delivery and pressure, which are critical for the engine’s performance and longevity ³.

Common Issues and Troubleshooting

Typical problems that may arise with the Cummins 4003950 Lubricating Oil Pump include oil leaks, insufficient oil pressure, and pump failure. Troubleshooting steps may involve inspecting the pump for signs of wear or damage, checking oil levels and quality, and ensuring that the pump is properly installed and aligned. Solutions may range from simple adjustments to more complex repairs or replacements, depending on the issue identified.

Maintenance Tips

To ensure the optimal performance and longevity of the Cummins 4003950 Lubricating Oil Pump, regular maintenance practices are recommended. These include periodic inspection for leaks or damage, cleaning the pump and its components to remove any contaminants, and following manufacturer guidelines for oil changes and filter replacements. Additionally, adhering to scheduled maintenance intervals can help prevent issues and extend the life of the pump.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history spanning over a century, Cummins has established a strong reputation in the commercial truck industry for producing reliable and high-performance products. The company’s extensive product range and commitment to innovation contribute to its standing as a trusted provider of engine components and systems.

Compatibility with Cummins Engines

The Cummins part number 4003950, a Lubricating Oil Pump, is designed to fit a variety of Cummins engines. This part is integral in ensuring that the engine’s lubrication system operates efficiently, maintaining the health and longevity of the engine components.

ISM Series Engines

• The ISM CM570, ISM CM570/870, ISM CM876, ISM11 CM876 SN, and QSM11 CM876 engines all utilize the 4003950 oil pump. These engines are known for their robust performance and are commonly used in heavy-duty applications.

L10 Series Engines

• The L10 CELECT, L10 GAS, and L10 MECHANICAL engines are also compatible with the 4003950 oil pump. These engines are designed for versatility, offering options for different fuel types and applications.

M11 Series Engines

• The M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL engines are another set of engines that can use the 4003950 oil pump. These engines are engineered for high performance and efficiency, making them suitable for a wide range of applications.

Each of these engines, despite their different configurations and applications, shares a common need for a reliable and efficient lubrication system, which the 4003950 oil pump provides.

Role of Part 4003950 Lubricating Oil Pump in Engine Systems

The lubricating oil pump, identified by part number 4003950, is an essential component within the engine system, ensuring the efficient circulation of lubricating oil to various engine parts. This pump works in conjunction with the cylinder block and other related components to maintain optimal engine performance and longevity.

Integration with the Cylinder Block

The cylinder block serves as the structural foundation of the engine, housing the cylinders, pistons, and other critical components. The lubricating oil pump is strategically positioned to draw oil from the sump or oil pan and deliver it under pressure through the oil galleries within the cylinder block. This ensures that the moving parts, such as the pistons, crankshaft, and camshaft, receive a consistent supply of oil. The oil galleries within the cylinder block are designed to distribute oil to these components, reducing friction and wear.

Function within the Cylinder Block Kit

A cylinder block kit often includes various seals, gaskets, and bearings designed to enhance the performance and seal integrity of the cylinder block. The lubricating oil pump plays a significant role in this setup by ensuring that these seals and bearings are adequately lubricated. Proper lubrication prevents leaks, reduces wear on the seals, and maintains the overall efficiency of the cylinder block kit. The pump’s reliable operation is vital for the kit’s components to function as intended, contributing to the engine’s smooth operation and durability.

Lubricating Oil Circulation

The primary function of the lubricating oil pump is to circulate oil throughout the engine. Once the pump draws oil from the sump, it pressurizes it and sends it through the oil filter to remove contaminants. The filtered oil then travels through the oil galleries in the cylinder block, reaching the crankshaft, camshaft, valve train, and other moving parts. This continuous circulation of clean, pressurized oil is essential for reducing friction, dissipating heat, and protecting engine components from wear and damage.

Conclusion

In summary, the lubricating oil pump (part 4003950) is integral to the engine system, working seamlessly with the cylinder block and cylinder block kit to ensure all moving parts are properly lubricated. Its role in maintaining the health and efficiency of the engine cannot be overstated, making it a key component in any engine system.