CATBearing & Bushing

4543745 Main Bearing Kit — Cat 120M 120M 2

This is a main bearing kit designed to support the rotating crankshaft within the engine's crankcase, ensuring proper alignment and reduced friction. It meets stringent OEM material and dimensional standards, providing superior wear resistance compared to a worn or damaged bearing set. Operators may notice a knocking sound from the engine, a significant drop in oil pressure, or increased exhaust smoke when these bearings begin to fail.

Main Bearing Kit – Part No 4543745 – 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 TypeMain Bearing Kit
MaterialSteel alloy with bearing overlay
ApplicationEngine crankshaft support
Service LifeReplace every 5,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of main bearing failure often include a distinct knocking or rattling sound originating from the engine's lower end. If left unaddressed, this noise will intensify, accompanied by a noticeable decrease in oil pressure and potential increases in exhaust emissions. Continued operation with failing main bearings risks severe crankshaft and engine block damage.

Installation Tip

Ensure the crankshaft and bearing surfaces are meticulously cleaned and free of any debris before installation. Avoid overtightening the main bearing caps, as this can distort the bearing shells and compromise oil clearance.

Service Note

Inspect the crankshaft journals for scoring or wear, and replace the connecting rod bearings at the same time.