CATEngine Parts

125-3005 Crankshaft — Cat 320B 320C

This crankshaft is the central rotating component of the engine, converting reciprocating linear piston motion into rotational torque. Manufactured to meet rigorous OEM standards, it provides the structural integrity and precise balancing required for smooth engine operation, unlike a worn or damaged crankshaft which may exhibit cracks or bearing surface wear. Symptoms of a failing crankshaft include knocking noises from the engine, excessive vibration, and potential oil pressure loss, which can escalate to severe engine damage if not addressed.

Crankshaft – Part No 125-3005 – 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 TypeCrankshaft
MaterialForged steel
ApplicationEngine crankshaft
Service LifeDesigned for engine life, replace on failure
CompatibilityCAT 318C, 319C, 320, 320B, 320C excavators
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early signs of crankshaft failure often include a persistent knocking sound from the engine, especially under load, and noticeable increases in vibration. If ignored, this can lead to severe internal engine damage, including connecting rod or main bearing failure and potential crankshaft fracture.

Installation Tip

Ensure all crankshaft bearing journals are meticulously cleaned and free of any debris before installation to prevent premature wear. Never reuse old main or connecting rod bearing shells; always install new ones with the new crankshaft.

Service Note

Inspect and replace engine bearings (main and connecting rod) and check piston connecting rods for straightness when replacing the crankshaft.