CATEngine Parts

255-5662 Relief Valve — Cat 320D

This is a high-quality relief valve designed to regulate hydraulic system pressure, preventing over-pressurization and protecting components. Manufactured to meet strict OEM specifications, it ensures precise pressure control and durability, unlike a worn valve that may stick or leak. Operators may notice erratic hydraulic function, sluggish implement movement, or unexpected system pressure drops when this valve fails.

Relief Valve – Part No 255-5662 – 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 TypeRelief Valve
MaterialHardened Steel
ApplicationHydraulic System Pressure Control
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing relief valve might be inconsistent hydraulic pressure readings or sluggish operation of hydraulic functions. If left unaddressed, the system may experience uncontrolled pressure spikes or a complete loss of hydraulic power. This can lead to damage of hydraulic components like pumps and cylinders.

Installation Tip

Thoroughly flush the hydraulic system to remove any debris before installing the new valve. Avoid cross-threading the valve into its port, as this can damage the threads on both the valve and the hydraulic manifold.

Service Note

Inspect the hydraulic filter and fluid for signs of contamination or degradation when replacing the relief valve.