CATEngine Parts

455-7978 Piston Pump — Cat 428F2 434F2

This piston pump is a vital component of the hydraulic system, generating pressurized fluid flow to operate various machine functions like boom, stick, and bucket movements. Manufactured to meet strict OEM specifications, it provides consistent and reliable hydraulic power, unlike a worn pump which may exhibit internal leakage or reduced flow. Operators will typically notice slow or erratic hydraulic functions, a whining noise from the pump, or a loss of system pressure when this part begins to fail.

Piston Pump – Part No 455-7978 – 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 TypePiston Pump
MaterialCast iron, steel alloys
ApplicationMain hydraulic system
Service LifeReplace on condition or during hydraulic system overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing piston pump is often a noticeable decrease in the speed and responsiveness of hydraulic functions. This can progress to intermittent operation or complete loss of hydraulic power, accompanied by a distinct whining sound. If left unaddressed, the pump can overheat and fail completely, rendering the equipment inoperable and potentially damaging other hydraulic components.

Installation Tip

Thoroughly flush the hydraulic system to remove any contaminants before installing the new pump. Ensure the pump shaft is properly aligned with the drive coupling to prevent premature wear.

Service Note

When replacing the piston pump, it is crucial to inspect and replace the hydraulic filter element and check the hydraulic fluid for signs of contamination.