CATEngine Parts

239-8983 Relief Valve — Cat 349D

This is a high-pressure relief valve designed to protect hydraulic systems from over-pressurization by venting excess fluid. It is manufactured to meet strict OEM specifications, ensuring reliable operation and precise pressure regulation, unlike a worn valve that may stick open or closed. Operators might observe erratic hydraulic function, a sudden drop in system pressure, or a noticeable increase in hydraulic oil temperature when this valve malfunctions.

Relief Valve – Part No 239-8983 – 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 Relief Valve
MaterialHardened Steel
ApplicationHydraulic System Pressure Regulation
Service LifeReplace as needed based on system diagnostics
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing relief valve may first manifest as inconsistent hydraulic actuator speed or reduced lifting/digging force. If left unaddressed, the valve could stick open, causing a constant loss of pressure and sluggish operation, or stick closed, leading to potentially damaging over-pressurization of the system. Ignoring these symptoms risks damage to pumps, cylinders, and hoses due to improper pressure control.

Installation Tip

Ensure the hydraulic system is properly depressurized before attempting removal to prevent injury and fluid loss. When installing, use a new sealing washer and tighten to the manufacturer's specified torque to prevent leaks.

Service Note

Inspect the hydraulic filter and oil for contamination, and check other pressure-sensitive components for signs of stress.