CATElectrical Parts

6N2789 Pulley — Cat 120B 140B

This is a high-quality pulley designed to guide and tension drive belts within the engine or auxiliary systems. Manufactured from durable materials, it ensures smooth rotation and consistent belt performance, unlike worn pulleys that can cause belt slippage and premature wear. Operators may notice increased noise from the engine bay, excessive belt vibration, or a broken drive belt when this pulley fails.

Pulley – Part No 6N2789 – CAT Spare Part
Part Specifications
BrandCAT
CategoryElectrical 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

Disconnect main battery before working on electrical components. Use dielectric grease on all connector pins. Check ground connections — most electrical faults trace to poor grounds. Test with multimeter before installing new parts.

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 belt system
Service LifeReplace every 4,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The first sign of a failing 6N2789 pulley is often an audible squealing or grinding noise from the engine compartment. If ignored, this can lead to accelerated wear on the drive belt, causing it to fray or break. A broken drive belt will result in the loss of power to critical components like the alternator or water pump.

Installation Tip

Before removing the old pulley, mark its orientation if it's keyed to ensure correct alignment during installation. Do not overtighten the pulley mounting bolt, as this can damage the shaft or the pulley itself.

Service Note

Inspect the drive belt and any tensioners for wear or damage whenever replacing this pulley.