CATCooling System

4n8871 Spider As-Fan — Cat 517 916

This is a fan spider, a crucial component that connects the fan blades to the water pump shaft or engine pulley, facilitating engine cooling. Manufactured to meet rigorous standards, it offers superior strength and balance compared to a worn or bent spider. Operators may observe excessive fan vibration, noise, or a loss of cooling efficiency when this part fails.

Spider As-Fan – Part No 4n8871 – 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 Spider
MaterialCast Iron
ApplicationEngine Cooling Fan Drive
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing fan spider is often increased vibration or an unusual noise emanating from the fan area. If ignored, the imbalance can cause premature wear on the water pump or pulley bearings and reduce cooling effectiveness. Continued operation with a damaged spider risks fan blade detachment or damage to connected components.

Installation Tip

Ensure the mounting surfaces on the fan blades and the drive shaft are clean and undamaged before assembly. Do not use excessive force when tightening the bolts, as this can strip threads or distort the spider.

Service Note

Inspect the fan blades for cracks or bends and check the condition of the water pump or pulley bearing during fan spider replacement.