CATEngine Parts

277-4167 Bucket Cylinder Seal Kit — Cat 305D 305E

This bucket cylinder seal kit is designed to prevent hydraulic fluid leakage and maintain system pressure within the excavator's bucket cylinder. It is manufactured with durable sealing materials to withstand high pressures and harsh operating conditions, unlike worn or cracked seals. Operators may experience slow or jerky bucket movements, external hydraulic fluid leaks around the cylinder, or a loss of lifting capacity when this seal kit fails.

Bucket Cylinder Seal Kit – Part No 277-4167 – 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, Urethane
ApplicationExcavator Bucket Cylinder
Service LifeReplace as needed based on inspection or leakage
CompatibilityCAT C2.4, Excavator 305D, 305E, 304C CR
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing bucket cylinder seal kit is often a visible hydraulic fluid leak around the cylinder rod or barrel. This can progress to sluggish or erratic operation of the bucket, requiring more effort to lift or position. If left unaddressed, the leak can worsen, leading to a significant loss of hydraulic pressure and compromised machine functionality.

Installation Tip

Carefully inspect the cylinder rod and bore for any nicks or scratches that could damage the new seals during installation. Ensure all old seal material is completely removed from the grooves before inserting the new seals.

Service Note

Inspect the hydraulic fluid reservoir for contamination and check the hydraulic pump and hoses for any signs of wear or leaks when replacing the cylinder seal kit.