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4390735
Idler Pulley
Cummins®

AVAILABLE

Cummins®

More than 10 are currently available

Ships within 2-4 business days

$60.95 $72.53
Genuine OEM Part

This truck part is made by Cummins®. We guarantee that all of our parts are from the OEM (original equipment manufacturer), ensuring a proper fit and quality manufacturing.

Manufacturer Warranty*
DESCRIPTION

The 4390735 Idler Pulley, manufactured by Cummins, is a critical component designed for use in commercial trucks. This article provides an overview of the idler pulley’s function, its role in truck operations, key features, benefits, and maintenance suggestions.

Basic Concepts of Idler Pulleys

An idler pulley is a type of pulley used in belt-driven systems to change the direction of a belt or to provide additional tension. It does not drive any component directly but ensures the belt remains properly aligned and tensioned. This is essential for the efficient and reliable operation of the belt-driven system 3.

Function and Role in Truck Operation

The 4390735 Idler Pulley plays a role in maintaining the proper tension and alignment of belts in the engine’s accessory drive system. This ensures efficient operation of components such as the alternator, water pump, and air conditioning compressor. By keeping the belts properly tensioned and aligned, the idler pulley helps to maintain the performance and reliability of these engine accessories 1.

Key Features

  • Constructed from durable materials to withstand high stress and temperatures.
  • Designed for precise alignment and smooth operation.
  • Compatible with specific Cummins engine models.

These features ensure that the idler pulley can endure the demanding conditions within a commercial truck engine while providing reliable performance 2.

Benefits

  • Enhances the reliability and efficiency of the belt-driven system.
  • Reduces wear and tear on belts and driven components.
  • Contributes to the overall performance and longevity of the engine.

By maintaining proper belt tension and alignment, the idler pulley helps to ensure that the belt-driven system operates smoothly and efficiently, which in turn supports the overall performance and durability of the engine 4.

Troubleshooting and Maintenance

Regular inspection of the idler pulley for signs of wear, such as grooves or cracks, is recommended. Ensuring proper tension and alignment of the belt system can prevent premature failure of the idler pulley and other components. Lubrication of the pulley’s pivot point, if applicable, can also extend its service life. These maintenance practices help to ensure the continued reliable operation of the belt-driven system 3.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. Known for their reliability and performance, Cummins components are widely used in commercial vehicles, including trucks. The 4390735 Idler Pulley is part of Cummins’ commitment to providing high-quality, durable components that support the efficient and reliable operation of commercial truck engines 4.

Conclusion

The 4390735 Idler Pulley is a vital component in the accessory drive system of commercial truck engines. Its role in maintaining proper belt tension and alignment ensures the efficient operation of critical engine accessories. Regular maintenance and inspection are essential to ensure the continued reliability and performance of this Cummins part.

  1. Barton, D. C., & Fieldhouse, J. D. (2009). Automotive Chassis Engineering Powertrain Chassis System and Vehicle Body. Elsevier.

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  2. Han, Z. (2022). Simulation and Optimization of Internal Combustion Engines. SAE International.

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  3. Sclar, D. (2008). Auto Repair for Dummies: 2nd Edition. For Dummies.

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  4. Cummins Inc. (n.d.). Operation and Maintenance Manual for QSK38 CM2350 K138M. Bulletin Number 5613394.

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SPECIFICATIONS

Package Dimensions
4.5 x 4.875 x 4.375 in
Weight
1.2 lb
* This information is provided as is and may be out of date. Please contact us or the manufacturer to verify warranty coverage.
* Variable geometry turbocharger and electronic actuator repairs are not eligible to be claimed as over-the-counter under New or ReCon parts warranty for parts installed after October 1, 2018.
* Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), Selective Catalyst Reduction (SCR) catalyst, and Electronic Control Module (ECM) repairs are not eligible to be claimed as over-the-counter under New or ReCon parts warranty for parts installed after January 1, 2020.
* These restrictions are only applicable to New parts and ReCon parts coverages for the components listed above sold to a customer in the US or Canada. All other coverages are excluded. All other regions are excluded.

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