CATEngine Parts

222-0084 Main Relief Valve — Cat 320C 320D

This is the main relief valve for the hydraulic system, regulating system pressure to prevent overloads. It is manufactured to meet stringent OEM quality standards, ensuring superior durability and performance compared to worn or damaged valves. Operators may notice a loss of hydraulic power, erratic boom or bucket movements, or a whining noise from the pump if this valve fails.

Main Relief Valve – Part No 222-0084 – 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 Main Relief Valve
MaterialHardened Steel
ApplicationMain Hydraulic System Pressure Control
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of failure may include a slight decrease in hydraulic system responsiveness. If left unaddressed, the system may begin to exhibit inconsistent pressure, leading to reduced operational efficiency and potential overheating. Continued operation with a faulty relief valve risks damage to the hydraulic pump and other critical system components.

Installation Tip

Ensure the hydraulic system is properly depressurized before removal to prevent injury. Avoid overtightening the valve body, as this can distort the sealing surfaces and cause leaks.

Service Note

Inspect the hydraulic filter and fluid for contamination when replacing the main relief valve.