CATEngine Parts

247-8998 Boom Cylinder Seal Kit — Cat 3066 318C

This is a CAT Boom Cylinder Seal Kit, containing all necessary seals and O-rings to rebuild a hydraulic boom cylinder for specific CAT excavators. It is manufactured to meet OEM specifications for material composition and sealing performance, ensuring reliable hydraulic operation. Operators might experience hydraulic fluid leaks around the boom cylinder, sluggish boom movement, or a loss of hydraulic pressure if these seals fail.

Boom Cylinder Seal Kit – Part No 247-8998 – 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, Polyurethane
ApplicationBoom Cylinder
Service LifeReplace as needed based on inspection and leakage
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of failing boom cylinder seals is often visible hydraulic fluid leakage around the cylinder rod or barrel. If not addressed, this leakage will worsen, leading to a gradual loss of lifting power and slower boom operation. Continued operation with leaking seals can lead to internal cylinder damage and contamination of the hydraulic system.

Installation Tip

Thoroughly clean the cylinder bore and piston rod before installing new seals to prevent contamination and ensure a proper seal. Avoid using sharp tools that could scratch or cut the new seals during insertion.

Service Note

When replacing boom cylinder seals, inspect the cylinder barrel and rod for scoring or wear, and check the hydraulic fluid for contamination.