CATEngine Parts

9j-5055 Vane Pump — Cat Engine 3304 Loader 930

This vane pump is a hydraulic component responsible for generating flow and pressure within the machine's hydraulic system. It is manufactured to meet the demanding performance and durability requirements of Caterpillar equipment, ensuring consistent hydraulic power delivery compared to a worn or damaged pump. Operators may notice slow or erratic hydraulic functions, a loss of lifting or steering power, or whining noises from the hydraulic pump area when this vane pump begins to fail.

Vane Pump – Part No 9j-5055 – 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 TypeVane Pump
MaterialHardened steel and cast iron
ApplicationHydraulic system
Service LifeReplace as needed based on hydraulic system diagnostics
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing vane pump typically first manifests as sluggish or inconsistent operation of hydraulic systems. If ignored, this can progress to a complete loss of hydraulic power for functions like lifting, steering, or implement movement. The equipment may become inoperable, leading to significant downtime.

Installation Tip

Thoroughly flush the hydraulic system to remove any debris before installing the new pump, as contaminants can quickly damage new components. Do not overtighten the mounting bolts, as this can distort the pump housing.

Service Note

Inspect the hydraulic fluid, filters, and all hydraulic lines and cylinders for leaks or wear when replacing the vane pump.