CATEngine Parts

31939aa191 Pressure Reducing Valve — Cat C15

This pressure reducing valve regulates hydraulic system pressure to prevent over-pressurization and ensure component longevity. It is manufactured to meet stringent CAT quality standards, offering superior durability compared to worn valves that may leak or fail to regulate pressure. Operators may notice erratic hydraulic system performance, such as slow boom or bucket movements, or a loss of system power when this valve begins to fail.

Pressure Reducing Valve – Part No 31939aa191 – 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 TypePressure Reducing Valve
MaterialSteel alloy
ApplicationHydraulic system pressure regulation
Service LifeReplace as needed based on system performance
CompatibilityCAT specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Erratic hydraulic system operation, such as sluggish implement movement or inconsistent pressure readings, is the first sign of a failing valve. If ignored, the valve may stick open or closed, leading to reduced system efficiency or potential component damage. Continued operation with a faulty valve risks significant damage to the hydraulic pump and other critical system components.

Installation Tip

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

Service Note

Inspect the hydraulic filter for debris and consider flushing the hydraulic system if contamination is suspected when replacing this valve.