What does a idler pulley do?

    tension pulley

  • Helps to maintain proper tension on the serpentine belt
  • Reduces vibration and noise in the engine system
  • Assists in guiding the belt along its path
  • Prevents slippage of the belt
  • Increases the lifespan of the belt and other engine components

What happens when an idler pulley goes bad?

  • Causes the serpentine belt to slip or come off
  • Produces squeaking or grinding noises from the engine
  • Leads to overheating of the engine due to lack of proper cooling
  • Results in loss of power steering or air conditioning
  • Can damage other engine components if not replaced promptly

Does idler pulley need to be replaced?

  • Yes, if there is visible wear or damage on the pulley
  • When the pulley starts making unusual noises
  • If the serpentine belt keeps slipping off
  • As part of regular maintenance to prevent engine issues
  • When experiencing power steering or air conditioning problems

Advantages of idler pulley:

  • Improves engine performance and efficiency
  • Enhances overall engine system durability
  • Reduces maintenance and repair costs
  • Ensures smooth operation of the serpentine belt
  • Increases safety and reliability of the vehicle

tension pulley

Process of Compound Pulley


The mold is created to form the shape of the idler pulley.


The molten raw materials are poured into the mold to form the pulley.

raw materials

High-quality materials are used to ensure durability and performance.


The pulley is produced using precision manufacturing techniques.


Each pulley undergoes rigorous testing to ensure quality and reliability.

Antirust treatment

A special coating is applied to prevent rust and corrosion.

seperate inspection

Each pulley is individually inspected for defects or imperfections.


Quality control marks are added to identify the pulley’s specifications.

What is the function of the tensioner and idler pulley?

  • Provide proper tension to the serpentine belt
  • Reduce wear and tear on the belt and other components
  • Guide the belt along its path smoothly
  • Help maintain engine performance and efficiency
  • Ensure reliable operation of the vehicle’s systems

How to stop a idler pulley from squeaking?

  • Check for proper alignment of the pulley
  • Apply lubricant to the pulley bearings
  • Inspect and replace the serpentine belt if necessary
  • Tighten the pulley mounting bolts
  • Seek professional help if the issue persists

About HZPT

Founded in 2006, HZPT is a leading manufacturer of precision transmission components based in Hangzhou. We specialize in producing various engineered parts and can customize products to meet your specific requirements. Our advanced production capabilities allow us to create complex products with high precision. With a focus on quality and efficiency, we have gained a reputation for excellence in the European and American markets. We offer top-notch services, superior product quality, and competitive prices. Our one-stop assembly production service eliminates intermediaries, saving you time and costs. No matter the size of your project, we strive to provide the best parts and services to meet your needs. Join us early and let us help you spend wisely!

V Pulley