CATEngine Parts

1275969 Gear-Sun — Cat 320C 320D

This sun gear is a vital component of the planetary gear set within the final drive or transmission system, transmitting torque from the drive shaft to other gears. Manufactured from hardened steel for maximum wear resistance and strength, it ensures efficient power transfer, unlike a worn sun gear which may exhibit chipped teeth or excessive play. Operators may notice whining noises, a loss of drive power, or difficulty engaging gears when the original sun gear begins to fail.

Gear-Sun – Part No 1275969 – 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
ApplicationFinal Drive / Transmission
Service LifeReplace as needed during drivetrain service
CompatibilityCTP aftermarket replacement
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The first indication of a failing sun gear is often an abnormal whining or grinding noise during operation, especially when under load. If ignored, the gear teeth can chip or break, leading to a significant loss of power or complete failure of the drive system. Continued operation risks severe damage to the entire drivetrain.

Installation Tip

Ensure all mating surfaces and bearing journals are meticulously cleaned and free of debris before installing the new sun gear. Never force the gear into position; it should seat smoothly if aligned correctly.

Service Note

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