Volvo Idler Pulley 21753149

This is a Deflection/Guide Pulley (often referred to as a tensioner pulley) engineered for various Volvo and Mack heavy-duty engines, designed to serve as a precision-rotating support component that maintains proper alignment and guidance for the V-ribbed accessory drive belt.

Product Specifications

Average Weight: ~ 0.65 kg

Compatibility: Widely used in Volvo D11 and D13 series engines, as well as Mack MP7 and MP8 engines; commonly found in heavy-duty trucks and industrial machinery.

SL: 3B

Key Information

The deflection/guide pulley is a critical maintenance component that ensures the efficient transmission of power from the crankshaft to the engine's auxiliary systems, such as the alternator, water pump, and air conditioning compressor. By providing a stable, low-friction surface for the drive belt, it prevents belt slippage, minimizes vibration, and maintains optimal tension throughout the drive system.