CATEngine Parts

3n-4866 O Ring Seal — Cat 3412 3408

This is a high-quality O-ring seal, essential for creating a tight, leak-proof barrier in hydraulic and engine systems. Manufactured from durable, oil-resistant elastomer to meet stringent OEM specifications, it provides superior sealing compared to brittle or degraded seals. Operators may notice fluid leaks, reduced system pressure, or the presence of oil in unexpected areas when this O-ring fails.

O Ring Seal – Part No 3n-4866 – 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 TypeO-Ring Seal
MaterialNBR Rubber (Nitrile Butadiene Rubber)
ApplicationEngine/Hydraulic System Sealing
Service LifeReplace during component overhaul or if leakage is observed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing O-ring is often a visible fluid leak around the sealed component or fitting. If left unaddressed, the leak will likely worsen, leading to a gradual loss of system pressure and potential contamination of the fluid. Continued operation with a compromised seal can result in component damage due to insufficient lubrication or pressure.

Installation Tip

Always lubricate the O-ring with a compatible fluid or lubricant before installation to prevent it from rolling or tearing. Ensure the groove is perfectly clean and free of any nicks or burrs that could damage the seal.

Service Note

Inspect the mating surfaces for any signs of wear or damage, and clean the seal groove thoroughly before installing a new O-ring.