CATEngine Parts

099-3789-0993789 Sun Gear 099 3789 — Cat 3116 E200B

This sun gear is a vital component within the planetary gear set of the transmission or final drive, transmitting torque and enabling speed reduction. Manufactured to meet precise OEM specifications, it ensures smooth power transfer and durability, unlike a worn gear with chipped or broken teeth that can cause noise and binding. Operators may hear grinding noises during operation, experience jerky movements, or notice a loss of drive power.

Sun Gear 099 3789 – Part No 099-3789-0993789 – 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 TypeSun Gear
MaterialHardened forged steel
ApplicationTransmission or final drive gear set
Service LifeReplace as part of a gear set overhaul or upon failure
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Audible gear grinding or clunking noises during operation are the first indicators of a worn or damaged sun gear. If ignored, the damage can propagate to other gears in the set, leading to increased vibration and a gradual or sudden loss of drive. The risk is severe drivetrain damage, potentially leading to complete immobilization of the machine.

Installation Tip

Ensure proper lubrication of all gear teeth and mating surfaces before assembly to prevent initial wear. Verify that the gear meshes smoothly with other components without binding or excessive play.

Service Note

Inspect the associated planet gears, ring gear, bearings, and seals for wear or damage when replacing the sun gear.