CATEngine Parts

518-5138 Hydraulic Cylinder Seal Kit — Cat 325D 330D

This hydraulic cylinder seal kit is designed to replace worn or damaged seals within the hydraulic cylinder assembly, ensuring proper system pressure and preventing fluid leaks. It is manufactured to meet stringent CAT quality standards, providing superior durability and sealing performance compared to degraded original seals. Operators may notice external fluid leaks around the cylinder rod, sluggish hydraulic operation, or a loss of lifting/actuating force when these seals fail.

Hydraulic Cylinder Seal Kit – Part No 518-5138 – 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 Cylinder Seal Kit
MaterialNBR rubber, PTFE, steel
ApplicationHydraulic cylinder sealing
Service LifeReplace as needed based on inspection
CompatibilityCAT specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

External hydraulic fluid leaks around the cylinder rod are the first sign of seal failure. If ignored, the leaks will worsen, leading to a gradual loss of hydraulic system pressure and reduced equipment performance. Continued operation with leaking seals can lead to internal component damage and potential downtime.

Installation Tip

Ensure all internal cylinder surfaces and the rod are meticulously clean before installing new seals to prevent damage. Avoid using sharp tools that could nick or cut the seal lips during insertion.

Service Note

Inspect the cylinder rod for any scoring or damage, as this will compromise the performance of new seals.