CATBearing & Bushing

4P7305 Main Bearing — Cat 3306

This main bearing is a vital component in the engine's crankshaft system, designed to provide a low-friction surface for the rotating crankshaft. Manufactured to meet rigorous OEM quality benchmarks, it offers superior wear resistance and load-bearing capacity compared to a compromised bearing. Operators may observe a noticeable drop in oil pressure, increased engine noise, or a loss of engine power when this bearing begins to fail.

Main Bearing – Part No 4P7305 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBearing & Bushing
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

Never strike bearings directly — use a bearing press or driver set. Heat housing (not bearing) to ease installation. Replace bearings in sets where applicable. Check housing bore diameter before fitting — out-of-round bores destroy new bearings.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeEngine Main Bearing
MaterialSteel alloy with overlay
ApplicationEngine crankshaft support
Service LifeReplace as part of engine overhaul or based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early symptoms of main bearing failure can include a slight increase in engine noise, particularly a knocking sound that may be more audible at idle or under load. As the wear progresses, the knocking will become more pronounced, and engine oil pressure may drop significantly. Continued operation risks severe crankshaft damage and potential engine seizure.

Installation Tip

Ensure the crankshaft journals and the bearing housings are scrupulously clean before installation, removing all traces of old oil and debris. Never reuse old bearing cap bolts; always use new ones torqued to specification.

Service Note

Inspect the crankshaft journals for scoring or out-of-roundness, and check the condition of the oil pump and pickup screen.