CATBearing & Bushing

1077708 Main Bearing — Cat 120H 120H ES

This is a main engine bearing designed to provide a critical low-friction interface between the crankshaft and the engine block, supporting immense forces. It is manufactured to meet stringent OEM standards, offering superior wear resistance and longevity compared to a worn or failed bearing. Operators may observe a distinct knocking sound from the engine, fluctuating oil pressure readings, or a general loss of engine performance when these bearings begin to fail.

Main Bearing – Part No 1077708 – 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
MaterialBabbitt lined steel
ApplicationEngine crankshaft support
Service LifeReplace every 5,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of main bearing failure is typically a deep knocking or rumbling sound emanating from the engine, especially under load. Continued operation will exacerbate this noise, potentially leading to erratic oil pressure and lubrication issues. The ultimate risk is severe damage to the crankshaft and engine block.

Installation Tip

Ensure the crankshaft journals and the bearing bores are immaculately clean and free from any debris or old gasket material before installing the new bearings. Never mix upper and lower bearing shells, as they are often precision-matched.

Service Note

Inspect the crankshaft journals for any signs of scoring or excessive wear, and check the connecting rod bearings for damage.