CATTransmission Parts

353-0538 Sun Gear — Cat 311C 312D

This sun gear is a fundamental component of the planetary gearset within the transmission, working with other gears to transmit and modify torque and speed. It is manufactured to precise OEM specifications, ensuring accurate meshing and durability, unlike a worn sun gear with rounded or damaged teeth. Operators may notice increased transmission noise, slipping under load, or a loss of drive power when this gear begins to wear.

Sun Gear – Part No 353-0538 – 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 planetary gearset
Service LifeReplace as needed based on inspection and performance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first symptom of a failing sun gear is often an increase in whining or humming noises from the transmission. This can progress to include rough shifting, slipping under load, and a general reduction in drive power. If left unaddressed, severe wear can lead to gear tooth breakage, causing significant internal transmission damage and potential immobilization.

Installation Tip

Ensure all mating surfaces and gear teeth are thoroughly cleaned and properly lubricated with the specified transmission oil before assembly. Avoid using excessive force to seat the gear, as this may indicate misalignment.

Service Note

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