CATEngine Parts

347-7963 Belt Tensioner — Cat 3406E 12M

This is a Belt Tensioner, a vital component in the engine's accessory drive system that maintains optimal tension on the drive belts. It utilizes a spring-loaded mechanism to automatically adjust for belt stretch and vibration, ensuring consistent power delivery to components like the alternator and water pump. A worn or seized tensioner will cause the drive belt to slip, leading to a loss of function in the driven accessories, and operators may notice a squealing noise from the belt or warning lights for battery or engine temperature.

Belt Tensioner – Part No 347-7963 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

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.

Part TypeBelt Tensioner
MaterialSteel, spring steel
ApplicationEngine accessory drive system
Service LifeTypically 3,000-5,000 hours or as needed
CompatibilityCAT 3406E
ConditionNew — OEM specification

Failure Symptoms

The first sign of a failing belt tensioner is often a persistent squealing noise from the accessory drive belt, especially on startup or under load. If the tensioner fails completely, the belt will likely slip or come off, leading to a loss of function for the alternator, water pump, or other driven accessories. This can result in battery discharge or engine overheating.

Installation Tip

Ensure the mounting surface for the tensioner is clean and free of debris to achieve a proper seal and prevent leaks. Do not over-extend the tensioner arm beyond its designed travel when installing the belt.

Service Note

When replacing the belt tensioner, it is advisable to inspect the condition of all accessory drive belts and pulleys for wear or damage.