CATEngine Parts

266-7806 Boom Cylinder Seal Kit — Cat 319D 319Dl

This is a boom cylinder seal kit, containing all necessary seals and O-rings to rebuild a hydraulic boom cylinder. It is essential for maintaining hydraulic pressure and preventing fluid leaks within the cylinder, ensuring smooth and controlled operation of the boom. Worn or damaged seals can lead to slow boom movement, external leaks, and loss of lifting capacity.

Boom Cylinder Seal Kit – Part No 266-7806 – 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 Kit
MaterialNBR rubber, polyurethane
ApplicationHydraulic boom cylinder
Service LifeReplace as needed during cylinder maintenance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Visible hydraulic fluid leaks around the boom cylinder rod are the most common sign of seal failure. You may also notice slow or jerky boom operation, or a loss of holding pressure when the boom is extended. Continued operation with leaking seals can lead to system contamination and reduced hydraulic efficiency.

Installation Tip

Lubricate all new seals with clean hydraulic fluid before installation to prevent tearing. Ensure all internal cylinder surfaces are free of nicks or scratches that could damage the new seals.

Service Note

Inspect the cylinder barrel and rod for scoring or wear, and check the hydraulic fluid for contamination.