CATUndercarriage

4N8090 Pulley — Cat D9G D9H

This is a pulley, a component designed to change the direction of force or transmit rotational motion within various drive systems, often found in engine or accessory drives. Manufactured to meet OEM quality standards, it provides smooth operation and durability, unlike worn pulleys that can cause belt slippage, noise, and premature belt failure. Operators may notice increased noise from the drive system, visible wobble of the pulley, or premature wear on the drive belt when this component is failing.

Pulley – Part No 4N8090 – 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 or steel
ApplicationDrive system (e.g., fan, alternator)
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early signs of a failing pulley include unusual noises like squealing or grinding from the drive system, or a visible wobble when the engine is running. If ignored, the pulley can seize or break apart, leading to immediate belt failure and the loss of function for the driven accessory (e.g., cooling fan, alternator). This can quickly result in engine overheating or a dead battery, causing significant operational disruption.

Installation Tip

Ensure the mounting shaft is clean and free of corrosion before installing the new pulley. Avoid using excessive force when tightening the mounting bolt, as this can damage the pulley or shaft.

Service Note

Inspect the drive belt for wear, cracks, or proper tension when replacing the pulley.