CATEngine Parts

349-4121 Bucket Cylinder Seal Kit — Cat 312E 320D

This Bucket Cylinder Seal Kit is essential for maintaining the integrity and performance of your excavator's hydraulic bucket cylinder. It contains all necessary seals to prevent hydraulic fluid leakage and contamination, ensuring smooth and powerful operation, unlike a worn kit that leads to cylinder drift and reduced lifting capacity. Operators may notice the bucket slowly lowering when not actively engaged, or a significant loss of breakout force.

Bucket Cylinder Seal Kit – Part No 349-4121 – 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 and polyurethane
ApplicationHydraulic bucket cylinder
Service LifeReplace based on cylinder performance and leakage
CompatibilityCAT C4 4 C7 C6 4 C4 2 Excavator 312
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing bucket cylinder seal kit is often a slow drift of the bucket when it is held in position, or a noticeable reduction in breakout force. If left unaddressed, internal leakage will worsen, leading to the bucket failing to hold its position under load and significantly reduced hydraulic efficiency. This can compromise digging performance and potentially cause damage to the cylinder rod or other hydraulic components.

Installation Tip

Carefully inspect the cylinder rod and bore for any scratches or burrs that could damage the new seals before installation. Lubricate the seals with a compatible hydraulic fluid to ease installation and prevent tearing.

Service Note

Inspect the hydraulic fluid level and condition, and check the hydraulic pump and hoses for any signs of wear or leaks when replacing bucket cylinder seals.