CATCooling System

91h20-03340 Fan Pulley — Cat C4000 C5000

This is a fan pulley, a crucial part of the engine's cooling system that drives the fan belt to spin the cooling fan. Manufactured to meet original equipment standards, it ensures proper belt tension and smooth operation, unlike a worn pulley which may wobble or seize. Operators might notice increased fan noise, belt slippage, or a rise in engine temperature if the fan pulley fails.

Fan Pulley – Part No 91h20-03340 – CAT Spare Part
Part Specifications
BrandCAT
CategoryCooling System
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

Flush cooling system with distilled water before refilling. Use pre-mixed coolant — never plain water, which causes corrosion. Pressure-test system after any cooling repair. Check thermostat by immersing in hot water — should open at rated temperature.

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

Part TypeFan Pulley
MaterialSteel
ApplicationEngine Cooling System
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing fan pulley may initially produce a squealing or grinding noise from the front of the engine, especially under load. If the pulley bearing seizes or the pulley becomes significantly damaged, the fan belt can slip or break, leading to rapid engine overheating. Failure to address these symptoms can result in severe engine damage due to lack of cooling.

Installation Tip

Ensure the new pulley is perfectly aligned with the crankshaft pulley and any other pulleys it shares a belt with. Overtightening the mounting bolt can damage the pulley or the water pump shaft it may be attached to.

Service Note

Always inspect and replace the fan belt if it shows signs of cracking, fraying, or excessive wear when replacing the fan pulley.