CATUndercarriage

4N5390 Pulley — Cat D8K

This pulley is a key component in the engine's accessory drive system, responsible for transmitting power from the engine to various components like the fan or alternator. Manufactured to strict specifications, it ensures smooth rotation and optimal power transfer, unlike a worn pulley with damaged bearings or a cracked surface. Operators may notice increased belt noise, premature belt wear, or a loss of function in driven accessories when this pulley begins to fail.

Pulley – Part No 4N5390 – CAT Spare Part
Part Specifications
BrandCAT
CategoryUndercarriage
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

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypePulley
MaterialCast iron
ApplicationEngine Accessory Drive System
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing pulley is often an audible squealing or grinding noise from the engine compartment, accompanied by excessive belt vibration. If left unaddressed, the pulley bearing can seize, leading to belt breakage and the loss of function for critical engine components like the cooling fan or alternator. This can result in engine overheating or electrical system failure.

Installation Tip

Ensure the pulley mounting bolt is torqued to the manufacturer's specification to prevent it from loosening during operation. Avoid using excessive force when removing or installing the pulley, as this can damage the shaft or the pulley itself.

Service Note

Inspect the drive belt, belt tensioner, and any other accessory pulleys for wear or damage when replacing this pulley.