CATEngine Parts

259-0627 Bucket Cylinder Seal Kit — Cat 320C

This bucket cylinder seal kit is essential for maintaining the hydraulic integrity of the excavator's bucket cylinder, preventing fluid loss and ensuring smooth, powerful operation. It includes all necessary seals manufactured to precise specifications, offering superior resistance to wear, heat, and hydraulic fluid compared to a worn or damaged kit. Operators may experience slow or jerky bucket movements, loss of lifting capacity, or visible hydraulic fluid leaks from the cylinder rod when this seal kit fails.

Bucket Cylinder Seal Kit – Part No 259-0627 – 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 TypeBucket Cylinder Seal Kit
MaterialNBR rubber, polyurethane
ApplicationExcavator bucket hydraulic cylinder
Service LifeReplace based on inspection, typically 2,500 hrs
CompatibilityCAT 3066, 3126, 3126B, Excavator 320C
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing seal kit is often a gradual loss of hydraulic pressure, resulting in slower bucket actuation or reduced breakout force. If left unaddressed, the cylinder may leak externally, leading to hydraulic system contamination and potential component damage. Continued operation can result in complete loss of hydraulic function for the bucket.

Installation Tip

Thoroughly clean the cylinder bore and rod before installing the new seals to prevent contamination and ensure a proper seal. Never use sharp objects to install seals, as this can easily damage their sealing surfaces.

Service Note

When replacing bucket cylinder seals, inspect the hydraulic fluid for contamination and consider replacing the hydraulic filter.