21766717

The primary function of the belt tensioner 21766717 is to accurately regulate and sustain the optimal tension of the engine belt. This belt connects and drives essential components, including the alternator, water pump, and air conditioning compressor. Maintaining appropriate tension is critical for ensuring the efficient operation of these components. Insufficient tension may lead to belt slippage, which can cause unstable power generation by the alternator, gradual battery discharge, and compromised functionality of vehicle electronics.

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Product Description

Model	OE Number	Model	OE Number
Volvo	20521447 21153968 21393207 21766717 85031791	RENAULT TRUCKS	7420521447 7421153968 7421766717

Main Functions

1. Maintaining Constant Tension:This is the most essential function of 21766717. Belts naturally elongate during use, and temperature fluctuations can also affect their length. The tensioner pulley compensates for these changes through an integrated spring, torsion bar, or hydraulic mechanism, maintaining the belt within the manufacturer-specified tension range.

2. Guiding Function:The tensioner pulley serves as an idler pulley, guiding the belt along complex paths to prevent it from rubbing against other engine components or derailing.

3.Shock Absorption and Buffering: During engine operation, vibrations and shocks occur. The damping mechanism inside the tensioner pulley (e.g., friction plates or hydraulic dampers) absorbs these vibrations, reducing belt oscillation and noise while protecting the belt and accessory bearings.

4.Simplified Installation and Maintenance:Compared to traditional manual tensioning devices, the automatic tensioner greatly simplifies belt installation and replacement, eliminating the need for regular manual inspections and adjustments.

Application Scenarios:

- Exceptional Performance Across Diverse Operating Conditions

- Long-Distance Freight Transportation: Ensuring Operational Efficiency and Reliability

- Continuous High-Speed Operation: Maintaining Tension Stability for Enhanced Performance

- Heavy Haulage: Robust Shock Resistance Under High-Load Start-Stop Conditions

- Engine Protection: Safeguarding Critical Components During Intensive Operations