CATEngine Parts

9x-3402 Size 16 20 16 — Cat 3306 C12

This component, often referred to as a seal or O-ring, is designed to prevent fluid leakage within various hydraulic or engine systems. Manufactured from durable, fluid-resistant materials, it maintains a tight seal under pressure and temperature variations, unlike a worn or damaged seal which allows leaks and contamination. Operators may notice visible fluid leaks, a drop in system pressure, or reduced component performance when this seal begins to fail.

Size 16 20 16 – Part No 9x-3402 – 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 TypeSeal / O-Ring
MaterialNBR rubber or similar elastomer
ApplicationHydraulic system sealing
Service LifeReplace as part of scheduled maintenance or when leaks are detected
CompatibilityCAT 3304, 3306, C12, 312C
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing seal is typically a visible fluid leak around the component it seals. If left unaddressed, the leak will worsen, potentially leading to a significant loss of hydraulic fluid and system pressure. This can compromise the operation of the equipment and lead to costly repairs.

Installation Tip

Ensure the sealing surfaces are perfectly clean and free of any burrs or sharp edges that could damage the new seal during installation. Lubricate the seal lightly with the system's operating fluid before insertion to prevent tearing.

Service Note

Clean and inspect the groove where the seal sits for any debris or damage; check mating surfaces for wear or scoring.