CATEngine Parts

129-8066 Main Hydraulic Pump — Cat 3064 312B

This main hydraulic pump is the heart of the machine's hydraulic system, generating the flow and pressure required for all hydraulic functions like boom, stick, and bucket actuation. Manufactured to meet stringent OEM quality standards, it offers superior durability and consistent performance compared to a worn pump with internal leakage or damaged gears. Operators may experience slow or erratic hydraulic movements, a noticeable decrease in lifting capacity, or a whining noise from the pump when this component begins to fail.

Main Hydraulic Pump – Part No 129-8066 – 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, Bronze
ApplicationMain hydraulic system
Service LifeReplace as needed based on performance and inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Slow or weak hydraulic functions, such as boom or bucket movement, are typical early signs of a failing main hydraulic pump. If left unaddressed, the pump's performance will degrade further, leading to reduced machine productivity and potential overheating of the hydraulic system. Continued operation risks damage to other hydraulic components due to insufficient flow or pressure.

Installation Tip

Ensure the hydraulic system is thoroughly flushed and clean before installing the new pump to prevent contamination. Never run the new pump dry; prime it with clean hydraulic oil before initial startup.

Service Note

Replace the hydraulic filter(s) and inspect the hydraulic oil for contamination when installing a new main hydraulic pump.