CATEngine Parts

358-5002 Piston Pump — Cat 257D 259D

This piston pump is a high-pressure hydraulic component essential for generating fluid flow within the machine's hydraulic system, powering functions like boom, stick, and bucket actuation. It is engineered to meet strict OEM performance and durability standards, offering consistent output and longevity compared to a worn pump that exhibits reduced flow, increased internal leakage, or erratic operation. Operators may notice sluggish hydraulic functions, a loss of lifting power, or whining noises from the hydraulic system as symptoms of a failing piston pump.

Piston Pump – Part No 358-5002 – 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 Piston Pump
MaterialHardened steel and bronze alloys
ApplicationMain hydraulic system
Service LifeReplace based on performance testing, typically 4000-8000 hrs
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing piston pump will first manifest as a noticeable decrease in the speed and power of hydraulic functions, often accompanied by increased heat in the hydraulic oil. If not addressed, the pump's internal wear will worsen, leading to erratic operation, potential system cavitation, and a significant loss of productivity. Continued operation risks severe damage to other hydraulic components due to insufficient flow or contamination from pump wear.

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 bearing failure.

Service Note

Always replace the hydraulic filter and inspect the hydraulic oil for contamination when servicing or replacing a piston pump.