CATEngine Parts

247-8868 Boom Cylinder Seal Kit — Cat 3066 319Dl

This is a seal kit specifically designed for the boom cylinder of construction equipment, containing all necessary seals to rebuild the cylinder. It is manufactured from high-quality, durable materials that resist hydraulic fluid and abrasion, ensuring a tight seal and preventing leaks that would occur with worn or damaged seals. Operators may notice slow or jerky boom movements, external hydraulic fluid leaks around the cylinder, or a loss of lifting capacity when this seal kit fails.

Boom Cylinder Seal Kit – Part No 247-8868 – 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 sealing
Service LifeReplace as needed based on inspection
CompatibilityCAT 3066, C6.4, C4.2 engines
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of failing boom cylinder seals is often external hydraulic fluid leakage around the cylinder rod or casing. This can progress to slower, less responsive boom operation, or the boom may drift down under load. Continued leakage and poor performance can lead to reduced operational efficiency and potential damage to the hydraulic system from contamination.

Installation Tip

Carefully inspect the cylinder bore and rod for any scoring or damage before installing new seals, as imperfections can quickly damage new seals. Ensure all seals are properly lubricated with system-compatible hydraulic oil before insertion.

Service Note

Inspect the hydraulic fluid reservoir for contamination and consider flushing the hydraulic system when rebuilding a cylinder.