CATEngine Parts

397-3680 Main Hydraulic Pump — Cat 320D2 320D2Gc

This is the primary component responsible for generating hydraulic pressure to operate the machine's functions, such as boom, stick, and bucket movements. Manufactured to precise Caterpillar standards, it offers superior efficiency and longevity over worn units that may exhibit internal leakage. Operators may notice sluggish or erratic hydraulic functions, a loss of lifting power, or a whining noise from the hydraulic system when this pump is failing.

Main Hydraulic Pump – Part No 397-3680 – 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 TypeMain Hydraulic Pump
MaterialCast Iron, Steel Alloys
ApplicationMain Hydraulic System
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of a failing main hydraulic pump include a noticeable decrease in the speed and power of hydraulic functions. If ignored, the pump may begin to overheat the hydraulic fluid, leading to erratic operation and potential system component damage. Continued operation risks complete loss of hydraulic power, rendering the equipment inoperable.

Installation Tip

Thoroughly flush the entire hydraulic system and replace all filters 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

Replace the hydraulic filters and inspect the hydraulic fluid for contamination; consider replacing hydraulic fluid and reservoir seals.