CATEngine Parts

344-1722 Belt Tensioner — Cat 320D

This belt tensioner is an automatic device that maintains the correct tension on the engine's accessory drive belt, ensuring optimal power transfer to components like the alternator and air conditioning compressor. It is engineered to provide consistent tension throughout its service life, unlike a worn or weak tensioner that allows the belt to slip, leading to reduced accessory performance and premature belt wear. Operators might notice a persistent belt squeal, especially on startup or acceleration, or observe that accessories are not functioning correctly when this tensioner fails.

Belt Tensioner – Part No 344-1722 – 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 TypeAutomatic Belt Tensioner
MaterialSteel, Rubber
ApplicationEngine Accessory Drive Belt System
Service LifeReplace every 100,000 miles or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing belt tensioner often first manifests as a high-pitched squealing noise from the drive belt, particularly noticeable during engine startup or when electrical loads change. If the tensioner fails completely, the belt will become slack, leading to intermittent or complete loss of function for accessories like the alternator or water pump. The most critical outcome is the potential for the belt to slip off entirely, disabling essential systems and possibly causing the engine to overheat or stall.

Installation Tip

Always release the tensioner slowly and carefully to avoid sudden spring release or damage to the tensioner mechanism. Ensure the new tensioner is correctly seated and aligned before applying belt tension.

Service Note

Inspect the accessory drive belt for wear, cracks, or contamination, and check the condition of the pulleys for damage when replacing the belt tensioner.