CATEngine Parts

1107050 Gear-Sun — Cat 320C 320D

This is a Sun Gear, a crucial component in the planetary gear set of a transmission or final drive, responsible for transmitting torque from the input shaft to the planetary carrier. Manufactured to meet high-quality standards, it ensures smooth power transfer and durability, unlike a worn gear with chipped or rounded teeth. Operators may notice a whining noise, difficulty engaging gears, or a complete loss of drive when this sun gear fails.

Gear-Sun – Part No 1107050 – 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
Service LifeReplace as needed based on wear
CompatibilityCAT 320C, 320D, 323D, 325D, 329E
ConditionNew — Aftermarket replacement

Failure Symptoms

An initial symptom of a failing sun gear might be an intermittent grinding noise during operation or slight hesitation when engaging drive. If left unaddressed, the noise will become constant, and drive performance will degrade, potentially leading to gear slippage. A complete failure of the sun gear will result in a total loss of power to the drive train, immobilizing the equipment.

Installation Tip

Ensure all mating surfaces and gear teeth are thoroughly cleaned and lubricated before assembly to prevent initial wear. Carefully align the gear to avoid cross-threading or damaging the gear teeth during installation.

Service Note

When replacing a sun gear, it is essential to inspect all other components of the planetary gear set, including planet gears, bearings, and the ring gear, for wear.