CATBearing & Bushing

4W5690 Main Bearing — Cat 641B 651

This is a main bearing designed to support the crankshaft within the engine block, crucial for the smooth operation of heavy machinery. Manufactured to precise tolerances, it offers superior wear resistance and load-bearing capacity compared to a damaged bearing showing signs of pitting or excessive clearance. Operators may observe a drop in oil pressure, unusual engine noises like knocking, or a loss of engine power when this component begins to fail.

Main Bearing – Part No 4W5690 – 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.

WhatsApp for Price & Availability☎ Call Mumbai Office

Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

3 PM IST.', };

Related CAT Parts

From the same category — may also be needed

7J9374
Bearing
6V5002
Frame Gp-Rear
4n4027
Kit Rep
6S4062
Universal Joint Gp
5P1948
5P1949
9J5942
Bearing

Browse all CAT Bearing Bushing →

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-backed babbitt
ApplicationEngine crankshaft
Service LifeReplace based on engine overhaul schedule
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The initial symptom of a failing main bearing is often an audible knocking sound from the engine, particularly under load. If left unaddressed, this can progress to a significant loss of oil pressure and increased crankshaft wear. Failure to replace a worn main bearing can lead to catastrophic engine damage, including crankshaft seizure.

Installation Tip

Carefully clean and inspect the crankshaft journals for any signs of wear or damage before installing the new bearings. Ensure the oil holes in the bearings align with the oil passages in the block and crankshaft.

Service Note

Inspect the crankshaft for straightness and wear, and check the connecting rod bearings.