TECHNICAL KNOWLEDGE
BELT DRIVE SYSTEM.
Identifying, diagnosing and replacing belt tensioners and idler pulleys on heavy-duty truck engines.
BELT DRIVE SYSTEM → BELT TENSIONER
BELT TENSIONER.
A belt tensioner keeps the correct tension on the accessory (serpentine) belt that drives the alternator, water pump, fan and air-conditioning compressor. It uses a spring-loaded arm and an idler pulley to absorb belt stretch and vibration.
GUIDES
- How to Identify the Correct Heavy-Duty Truck Belt TensionerLearn how to identify the correct heavy-duty truck belt tensioner using OE numbers, cross references, pulley diameter, grooves, bearing bore, mounting dimensions and engine application.
PACCAR MX13 Belt Tensioner
OE 1929107 / 1878397 / 2019364 / 2234864
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PACCAR Belt Tensioner
OE 1955997
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Freightliner / Cummins / Caterpillar Belt Tensioner
OE 3400885 / 2TB903150 / 961003410014 / D11862549
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Freightliner Belt Tensioner
OE 36T6K25AA
VIEW PRODUCT →BELT DRIVE SYSTEM → IDLER PULLEY
IDLER PULLEY.
Pulley diameter, groove profile and bearing bore — the dimensions that decide fitment.
GUIDES
- Heavy-Duty Truck Idler Pulley Bearing Failure: Symptoms, Causes and DiagnosisBad idler pulley symptoms on heavy-duty trucks: squeal, chirp, grinding, wobble and belt wear. Learn the causes, step-by-step diagnosis and what to replace.
- How to Identify the Correct Heavy-Duty Truck Belt TensionerLearn how to identify the correct heavy-duty truck belt tensioner using OE numbers, cross references, pulley diameter, grooves, bearing bore, mounting dimensions and engine application.
PARTS & CROSS REFERENCE
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