This belt tensioner assembly is a crucial component in the engine's accessory drive system, maintaining optimal tension on the serpentine belt. Manufactured with durable materials and precision bearings, it ensures consistent belt performance and prevents slippage. Operators may notice increased noise from the accessory drive, premature belt wear, or intermittent charging system issues when this tensioner begins to fail.
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Alternate part numbers that interchange with Volvo 21479276
Fitment: Volvo Trucks: FH13: 2006> 2007 FM13: 2006> 2007, Renault Trucks: Kerax DXi13, Magnum DXi13
Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
A chirping or rattling noise from the front of the engine, particularly noticeable at idle or during acceleration, is an early indicator of a failing tensioner. The noise may become more pronounced, and the serpentine belt could start to slip, leading to intermittent issues with accessories like the alternator or power steering. Continued operation risks belt failure, causing a loss of power steering and alternator function.
Before removing the old tensioner, note the direction of spring tension to ensure correct installation of the new unit. Do not reuse the old mounting bolt, as it may be stretched or weakened.
Always replace the serpentine belt when replacing the belt tensioner assembly.