CATEngine Parts

397-3941 Hydraulic Main Pump Assembly — Cat 306E 307E

This is a complete hydraulic main pump assembly that provides the high-pressure fluid flow essential for operating the machine's functions. It is built to meet rigorous OEM standards, offering superior durability and consistent performance over worn or failing pumps. Operators may notice a loss of hydraulic power, slow or erratic implement movement, or increased system noise when this pump begins to fail.

Hydraulic Main Pump Assembly – Part No 397-3941 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
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

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeHydraulic Main Pump Assembly
MaterialCast Iron, Steel, Seals
ApplicationMain Hydraulic System
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A noticeable decrease in hydraulic system performance, such as sluggish boom or bucket movement, is often the first indication of a failing main pump. If ignored, the pump's ability to generate adequate pressure will continue to degrade, leading to reduced machine productivity. Continued operation with a failing pump risks overheating the hydraulic system and damaging other components.

Installation Tip

Thoroughly flush the hydraulic system and replace the hydraulic filter before installing the new pump to prevent contamination. Ensure the pump shaft is properly aligned with the drive coupling to avoid premature wear.

Service Note

Inspect the hydraulic fluid reservoir and lines for debris, and replace the hydraulic filter and oil when installing a new main pump assembly.