CATEngine Parts

3350374 Oil Return Check Valve — Cat 330D

This oil return check valve is a vital component within the engine's lubrication system, regulating the flow of oil back to the sump. It is manufactured to precise OEM specifications, ensuring proper sealing and flow control, unlike a worn valve that might stick open or closed. Operators may notice increased oil pressure, oil level fluctuations, or potential lubrication system warnings when this valve malfunctions.

Oil Return Check Valve – Part No 3350374 – 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 TypeOil Return Check Valve
MaterialSteel and rubber
ApplicationEngine lubrication system
Service LifeReplace every 5,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing oil return check valve may initially present as inconsistent oil pressure readings or a slight delay in oil circulation after startup. If the valve sticks open, oil may drain back too quickly, leading to low oil pressure during operation. If it sticks closed, oil may not return to the sump properly, potentially causing oil level issues and inadequate lubrication.

Installation Tip

Ensure the valve is installed in the correct orientation as indicated by any flow direction markings. Do not use excessive force when tightening, as this can damage the valve seat.

Service Note

When replacing the oil return check valve, inspect the oil pump and oil pickup screen for any debris or signs of wear.