CATTransmission Parts

333-2989 Sun Gear — Cat 320D

This sun gear is a vital component of the planetary gear set within the transmission, responsible for transmitting rotational force from the input shaft to other gear elements. It is manufactured to meet rigorous OEM quality standards, ensuring precise meshing and durability against high torque loads. Operators may experience gear binding, transmission whine, or a complete loss of drive if this sun gear is damaged or worn.

Sun Gear – Part No 333-2989 – CAT Spare Part
Part Specifications
BrandCAT
CategoryTransmission 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

Drain and replace transmission fluid when servicing internal components. Use correct ATF specification. Pre-fill torque converters with fluid before installation. Allow 10 minutes for fluid to settle before checking level.

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, Transmission
Service LifeInspect during transmission overhaul or if symptoms arise
CompatibilityCAT Excavator 320, 323, 319D, 321D, 320D, 320E, 325F, 318
ConditionNew — OEM specification aftermarket

Failure Symptoms

An early sign of a failing sun gear might be a slight increase in transmission noise, particularly a whine that changes with engine speed. If the wear progresses, this can lead to rough shifting or intermittent gear engagement. Continued operation with a damaged sun gear can result in catastrophic failure of the entire planetary gear set, leading to a complete loss of drivetrain function.

Installation Tip

Ensure the gear teeth are properly lubricated with the correct transmission fluid before installation. Avoid rotating the gear set forcefully until it is fully assembled and meshed correctly.

Service Note

Inspect the planet gears and ring gear for wear or damage when replacing the sun gear.