Belt Tensioner Pulley 3976833 For 4BT Diesel Engine

Keywords: 3976833 belt tensioner pulley, 4BT engine belt tensioner assembly, excavator diesel engine tension wheel, construction machinery drive belt spare parts, aftermarket replacement belt tensioner

Product Overview

Belt Tensioner Pulley Part No.3976833 is an important driving‑belt tensioning component for 4BT diesel engine fitted on excavators and construction machinery. It maintains constant proper tension for fan and accessory drive belt, prevents belt slipping, shaking and abnormal noise, guarantees normal operation of water pump, alternator and other auxiliary devices. This replacement tensioner resolves common problems including belt deviation, slack, abnormal rattling noise and belt premature wear caused by original tensioner spring fatigue, bearing damage and pulley surface abrasion. Each belt tensioner undergoes torsion‑spring performance test, bearing rotation inspection and appearance check before shipment.

Detailed Specifications

Key Features & Advantages

• ✅ High‑quality aluminum alloy housing, good shock‑resistance performance, adapt to severe construction‑site vibration environment.
• ✅ Durable torsion spring, stable tension output, keep drive belt working at reasonable tightness for long time.
• ✅ High‑precision built‑in bearing, flexible rotation, low noise, reduce belt friction loss.
• ✅ Effectively eliminate belt slipping, abnormal rattling and fast belt wear caused by failed original tensioner pulley.
• ✅ Exact mounting dimension, direct replacement without modification, convenient for engine maintenance.

Application Scope

Fit Equipment: Excavators and heavy‑duty machinery equipped with 4BT diesel engine ‑ Widely applied for engine repair workshops and routine equipment maintenance projects.

Our Company Advantage

• We are professional supplier of full‑range construction machinery spare parts, supplying engine parts, hydraulic parts, electrical parts, seal kits and complete overhaul kits.
• Large ready stock for various machinery spare parts
• Factory‑direct wholesale competitive price
• Mixed‑order & one‑stop spare‑parts procurement supported
• Professional part‑number matching technical support service

Packaging & Shipping

• Neutral export carton with shock‑proof inner packing, prevent collision damage during long‑distance transportation
• Multiple shipping options: sea freight, air freight, international express for small trial orders
• Export documents such as Commercial Invoice, Packing List can be provided.

Contact Us

If you need more excavator spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.