CATBearing & Bushing

1280401 Main Bearing — Cat 140H 143H

This main bearing is a vital component in the engine's crankshaft system, engineered to minimize friction and ensure smooth rotational movement. It is produced to meet rigorous quality standards, providing enhanced durability and operational life over a worn component. Observable signs of failure include a persistent knocking sound from the engine and a potential decrease in oil pressure.

Main Bearing – Part No 1280401 – 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

fore 3 PM IST.', };

Related CAT Parts

From the same category — may also be needed

5J4929
Bearing
2417380
Bearing
1584795
Sprocket
4n3984
Bearing .020
2366270
Bearing
3537430
Main Bearing Kit

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

A noticeable knocking or rumbling noise originating from the engine, especially under load, is the first indication of a problem. If ignored, the noise will likely increase in severity, and oil pressure may drop, signaling excessive clearance. Continued operation risks severe damage to the crankshaft and engine block.

Installation Tip

Thoroughly clean the crankshaft journals and the bearing bores in the engine block; any contamination can lead to premature failure. Ensure proper lubrication of the bearing surfaces before assembly.

Service Note

When replacing main bearings, it is advisable to also inspect connecting rod bearings and the engine oil pump for optimal performance.