CATBearing & Bushing

9H3278 Bearing — Cat 320C 320D

This bearing is engineered to provide essential support and reduce friction for rotating components within the power train or hydraulic systems of excavators and other heavy machinery. Manufactured to meet strict OEM quality benchmarks, it offers superior resistance to wear and contamination compared to a worn bearing that may exhibit surface damage or excessive clearance. Operators may experience symptoms such as increased noise, vibration, or a loss of smooth operation in the affected system when this bearing begins to fail.

Bearing – Part No 9H3278 – 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 TypeBearing
MaterialHardened Steel
ApplicationPower Train / Hydraulic System
Service LifeReplace based on inspection or failure symptoms
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial indications of a failing bearing include a low-frequency rumbling or knocking sound that becomes more pronounced under load. If neglected, this can progress to severe vibration, overheating of the component, and a noticeable degradation in the performance of the affected system. The primary consequence is potential damage to associated components and significant unplanned downtime.

Installation Tip

Before installing, meticulously clean the bearing bore and ensure the shaft surface is free of any imperfections or old lubricant residue. Avoid using heat guns or open flames to expand the bearing; use a proper bearing heater or press for even application of force.

Service Note

Inspect the shaft and housing for any signs of wear or damage, and replace any seals or O-rings associated with the component.