CATEngine Parts

1107232 Gear-Sun — Cat 320C 320D

This sun gear is a crucial element within the planetary gear sets of Caterpillar 320C, 320D, and related series excavators, transmitting torque and enabling gear reduction for drive functions. It is manufactured from high-grade steel to meet rigorous wear resistance and strength standards, ensuring longevity over a worn gear exhibiting chipped teeth or excessive play. Operators may notice abnormal noises during operation, jerky movements, or a complete loss of drive power as symptoms of a failing sun gear.

Gear-Sun – Part No 1107232 – 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 Steel
ApplicationPlanetary Gear Set (Drive System)
Service LifeReplace based on inspection and wear
CompatibilityOEM specification
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The initial symptom of a failing sun gear is often an increase in operational noise from the drive system, potentially accompanied by slight jerking during acceleration or deceleration. If left unaddressed, the gear teeth can chip or break, leading to a loss of drive torque and potential binding within the transmission. Continued operation risks severe damage to the entire drive train, resulting in significant repair costs and extended equipment downtime.

Installation Tip

Ensure all mating surfaces and splines are clean and lubricated with appropriate assembly grease before installation. Avoid using excessive force to seat the gear, as this can damage the gear teeth or shaft.

Service Note

Inspect ring gears, planetary carriers, and bearings for wear or damage when replacing the sun gear.