CATTransmission Parts

322-0304 Sun Gear — Cat D3K D3K2

This is a high-quality sun gear, a crucial element within the transmission or final drive system that meshes with planetary gears to transmit power. Manufactured to meet rigorous Caterpillar standards, it offers superior wear resistance and durability over a worn or damaged gear. Operators might notice increased noise, vibration, or a loss of drive power, particularly under load, when this sun gear begins to fail.

Sun Gear – Part No 322-0304 – 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 alloy
ApplicationTransmission / Final Drive Planetary Set
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first symptom of a failing sun gear is often an increase in whining or grinding noises from the transmission or final drive, especially when accelerating or under load. If ignored, the gear teeth can wear down significantly, leading to intermittent power loss or complete drive failure. The main risk to the equipment is potential damage to other components within the drive train due to debris from gear failure.

Installation Tip

Carefully inspect the mating surfaces of the planetary carrier and ring gear for any burrs or damage before assembly. Ensure the gear is seated fully and squarely on its shaft to prevent misalignment.

Service Note

When replacing a sun gear, it is crucial to inspect the associated planetary gears, bearings, and seals for wear or damage.