CATBearing & Bushing

4W5689 Main Bearing — Cat 777

This is a precision-engineered main bearing designed to support the crankshaft within an engine, ensuring smooth rotation and optimal power delivery. It is manufactured to meet rigorous OEM quality standards, offering superior wear resistance and load-carrying capacity compared to a damaged or worn bearing. Operators may experience a noticeable drop in engine power, increased oil pressure fluctuations, or audible knocking sounds when this bearing begins to fail.

Main Bearing – Part No 4W5689 – 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 with babbitt overlay
ApplicationEngine crankshaft support
Service LifeReplace during engine overhaul or as needed
CompatibilityCAT D348 Engine, CAT 777
ConditionNew — CTP aftermarket replacement

Failure Symptoms

Early signs of main bearing failure include a deep knocking sound from the engine that increases with RPM, especially under load. If ignored, this can progress to severe engine vibration, a significant loss of oil pressure, and potential crankshaft damage. Continued operation risks catastrophic engine failure due to lack of lubrication and support.

Installation Tip

Ensure the crankshaft journals and bearing bores are perfectly clean and free of any debris or scoring before installation. Never reuse old bearing bolts; always use new, properly torqued fasteners.

Service Note

Inspect crankshaft journals for wear or damage, and check connecting rod bearings for signs of wear or damage at the same time.