CATEngine Parts

4W9989 Gear As — Cat 3306

This gear assembly is a vital component within the engine's timing or auxiliary drive system, ensuring precise synchronization of internal mechanisms. Manufactured to meet rigorous quality standards, it offers superior wear resistance and dimensional accuracy over a worn gear. Operators might observe increased gear noise, rougher engine operation, or intermittent loss of power if this gear assembly begins to fail.

Gear As – Part No 4W9989 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine 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

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

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

Part TypeGear Assembly
MaterialHardened Steel
ApplicationEngine Timing/Drive System
Service LifeReplace based on wear inspection or engine overhaul
Compatibility1673C, 3304, 3306, 3306B, 3306C
ConditionNew — CTP aftermarket replacement

Failure Symptoms

Initial signs of a failing 4W9989 gear assembly include audible gear whine or clatter from the engine, particularly at specific RPMs. If left unaddressed, this can lead to improper engine timing, reduced power output, and increased vibration. Continued operation risks damage to adjacent gears and timing components.

Installation Tip

Ensure proper alignment of the gear teeth with mating components to prevent binding or premature wear. Do not reuse old fasteners; always use new hardware as specified.

Service Note

Inspect the condition of the camshaft and crankshaft gears, as well as any associated bearings, when replacing the 4W9989 gear assembly.