CATUndercarriage

1280382 Main Bearing — Cat 140H 143H

This main bearing is a critical engine component that supports the crankshaft, reducing friction and wear within the engine block. It is manufactured to meet stringent OEM quality standards, ensuring superior durability and performance compared to worn bearings that exhibit increased clearance and potential for scoring. Operators may notice a loss of oil pressure, increased engine noise, or a general decrease in engine power when these bearings begin to fail.

Main Bearing – Part No 1280382 – CAT Spare Part
Part Specifications
BrandCAT
CategoryUndercarriage
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

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

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
ApplicationCrankshaft support
Service LifeReplace as part of engine overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of main bearing failure can include a persistent knocking sound from the engine, especially under load. If ignored, the increased clearance will lead to reduced oil pressure and potential crankshaft journal damage. Continued operation risks severe engine internal damage, necessitating a complete engine rebuild.

Installation Tip

Ensure the crankshaft journals are meticulously cleaned and free of any debris before installation. Avoid overtightening the bearing caps, as this can distort the bearing and lead to premature failure.

Service Note

Always inspect the crankshaft journals for scoring or wear and replace the oil pump if oil pressure is consistently low.