CATBearing & Bushing

7C6973 Main Bearing — Cat 320B

This is a main bearing designed to provide critical support for the crankshaft, ensuring smooth rotation and optimal engine performance. Manufactured to high standards, it offers superior wear resistance and durability over a worn component, maintaining proper oil clearance. Operators might observe increased engine noise, fluctuating oil pressure, or a noticeable loss of power when this bearing begins to fail.

Main Bearing – Part No 7C6973 – 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
MaterialSteel alloy with bearing material overlay
ApplicationEngine crankshaft support
Service LifeReplace every 5,000-10,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing main bearing may initially produce a deep knocking sound from the engine, especially when accelerating. If left unaddressed, the noise will become more pronounced, and oil pressure may drop, indicating reduced lubrication. Continued operation can lead to significant crankshaft damage and potential engine seizure.

Installation Tip

Ensure all bearing surfaces and crankshaft journals are perfectly clean and free of any debris before assembly. Do not reuse old bearing bolts; always use new ones to ensure proper clamping force and torque.

Service Note

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