CATBearing & Bushing

4W5488 Main Bearing — Cat 777

This is a main bearing, a crucial component within the engine's crankshaft system that reduces friction between the rotating crankshaft and the connecting rods. Manufactured to meet rigorous OEM specifications, it provides superior wear resistance and load-bearing capacity compared to a damaged bearing. Operators may observe a drop in oil pressure, increased engine noise, or a knocking sound from the engine when this bearing is failing.

Main Bearing – Part No 4W5488 – 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
MaterialBabbitt over steel
ApplicationEngine Crankshaft
Service LifeReplace during engine overhaul or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing main bearing can first manifest as a persistent, low-frequency knocking sound from the engine, especially under load. As wear progresses, this noise will intensify, and a significant drop in oil pressure may be observed, potentially leading to crankshaft damage.

Installation Tip

Thoroughly clean the crankshaft journals and bearing saddles before installation to prevent premature wear. Ensure the bearing caps are correctly oriented and torqued to specification.

Service Note

When replacing main bearings, it is essential to inspect the crankshaft for scoring or wear and to check connecting rod bearings for damage.