CATEngine Parts

099-6444 30A Coupling Assembly — Cat 305 306

This 30A coupling assembly is designed to connect rotating shafts, typically between an engine and a hydraulic pump or other accessory, to transmit torque smoothly. It is engineered to meet Caterpillar's demanding standards for vibration dampening and durability, offering superior resilience compared to a worn or damaged coupling. Operators might notice increased vibration, unusual noises from the drivetrain, or a loss of power to the connected component when this assembly fails.

30A Coupling Assembly – Part No 099-6444 – 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 TypeCoupling Assembly
MaterialRubber and Steel
ApplicationEngine to Hydraulic Pump Drive
Service LifeReplace based on inspection for cracks or wear
CompatibilityCAT C2.6 Engine; 305.5, 306 Excavators
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first symptom of a failing coupling assembly is often an increase in vibration felt through the machine's controls or structure. This can progress to audible knocking or grinding noises, and eventually, a complete disconnection of power to the driven component. Failure risks damage to both the engine crankshaft and the driven accessory, such as a hydraulic pump.

Installation Tip

Ensure the shaft ends are perfectly aligned before installing the new coupling to prevent premature wear. Do not use excessive force to seat the coupling; it should fit snugly but without binding.

Service Note

Inspect the engine crankshaft and the driven shaft (e.g., pump shaft) for any signs of wear or damage during coupling replacement.