Buy Cummins NT855 QSM11 M11 K19 Diesel Engine idler Pulley 3400883 | Tonkee®

Buy Cummins NT855 QSM11 M11 K19 Diesel Engine idler Pulley 3400883 | Tonkee®

Cummins NT855 QSM11 M11 K19 Diesel Engine idler Pulley 3400883 | Tonkee®
The idler pulley typically has a specific size and dimensions to fit seamlessly into the engine's belt drive system. While the exact measurements may vary slightly, it is essential to ensure that the 3400883 idler pulley is an exact match for your Cummins engine model to guarantee proper fit and function.
Cummins NT855 QSM11 M11 K19, Diesel Engine idler Pulley 3400883 | Tonkee®

The idler pulley, often overlooked, plays a vital role in engine operation.


It is part of the engine's belt drive system, which is responsible for transferring power from the engine to various accessories like the alternator, water pump, and air conditioning compressor. The idler pulley is tasked with maintaining proper tension in the drive belt, ensuring it stays securely in place while the engine is running. This tension is crucial for preventing belt slippage, which can lead to reduced performance and potential damage to engine components.

The Cummins 3400883 idler pulley is designed specifically for these engine models - NT855, QSM11, M11, and K19. Its specifications are tailored to meet the demands of these powerful engines and the industries they serve.

Material and Build: The 3400883 idler pulley is constructed with high-quality materials, often featuring a durable metal or alloy body. This robust construction ensures that it can withstand the harsh operating conditions that these engines are commonly exposed to, including extreme temperatures, high RPMs, and heavy loads.

Size and Dimensions: The idler pulley typically has a specific size and dimensions to fit seamlessly into the engine's belt drive system. While the exact measurements may vary slightly, it is essential to ensure that the 3400883 idler pulley is an exact match for your Cummins engine model to guarantee proper fit and function.

Bearing Type: Inside the idler pulley, there is a high-quality bearing that allows it to rotate smoothly.


The bearing is designed to withstand the engine's vibrations and temperature fluctuations while maintaining consistent tension on the drive belt.

Mounting and Installation: Installing the 3400883 idler pulley is relatively straightforward for experienced mechanics or technicians. It typically mounts securely to the engine block or bracket using bolts or fasteners. Proper installation is crucial to ensure that the idler pulley aligns correctly with the drive belt and operates effectively.

Maintenance: While the idler pulley is a relatively low-maintenance component, it's essential to inspect it regularly for signs of wear and tear. Over time, the bearing may degrade or the pulley's surface may become worn. Routine maintenance can help prevent unexpected failures and ensure the longevity of your engine's belt drive system.
Cummins NT855 QSM11 M11 K19 Diesel Engine idler Pulley 3400883 | Tonkee®
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