CATEngine Parts

204-2679 Swing Gearbox — Cat 330D

This swing gearbox is a crucial component of the excavator's upper structure, enabling controlled rotation of the cab and boom assembly. Manufactured to meet rigorous OEM standards, it provides smooth, precise movement and durability, unlike a worn gearbox that can cause jerky swings or grinding noises. Operators may notice slow or jerky swing movements, excessive noise during rotation, or an inability to hold position if the swing gearbox is failing.

Swing Gearbox – Part No 204-2679 – 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 TypeSwing Gearbox
MaterialHardened Steel Gears and Housing
ApplicationExcavator Swing Mechanism
Service LifeReplace during major overhaul or if signs of wear appear
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial symptoms of a failing swing gearbox include audible grinding or whining noises during rotation and a noticeable increase in the time it takes to swing the upper structure. If left unaddressed, the gearbox may develop excessive play, leading to imprecise positioning and potential damage to the slew ring. Continued operation risks a complete loss of swing function, immobilizing the excavator.

Installation Tip

Ensure the mounting surfaces on the chassis and the slew ring are perfectly clean and free of any burrs or damage before installation. Always use the correct type and amount of lubricant as specified by the manufacturer.

Service Note

Inspect the slew ring and swing motor for wear and proper function when replacing the swing gearbox.