CATEngine Parts

119-5446 Stick Cylinder Seak Kit — Cat 312B 312C

This stick cylinder seal kit is designed to maintain hydraulic pressure and prevent fluid leakage within the excavator's boom or stick hydraulic cylinder. Manufactured to meet high-durability standards, these seals offer superior resistance to wear, heat, and hydraulic fluid degradation compared to worn or damaged seals. Operators may notice slow or jerky cylinder movement, external hydraulic fluid leaks around the cylinder rod, or a loss of lifting/digging power as symptoms of a failing seal kit.

Stick Cylinder Seak Kit – Part No 119-5446 – 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
ApplicationExcavator hydraulic stick cylinder
Service LifeReplace when leaks or performance issues are detected
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing stick cylinder seal kit is often visible hydraulic fluid leakage around the cylinder rod or sluggish operation of the stick. If ignored, the leakage will worsen, potentially leading to a loss of hydraulic pressure and reduced machine functionality. Continued operation with compromised seals can cause internal cylinder damage and contamination of the hydraulic system.

Installation Tip

Carefully inspect the cylinder rod for any nicks or burrs that could damage the new seals during installation; polish or repair as needed. Ensure all seal grooves are meticulously clean before inserting the new seals to prevent premature failure.

Service Note

When replacing the stick cylinder seal kit, inspect the hydraulic fluid for contamination and consider replacing the hydraulic filter.