CATEngine Parts

259-0634 Boom Cylinder Seal Kit — Cat 3066 3126B

This is a seal kit designed to replace worn seals within the boom cylinder of CAT equipment, ensuring proper hydraulic pressure retention and smooth operation. It meets stringent OEM quality standards, providing a superior seal compared to degraded or damaged original seals. Operators may notice hydraulic fluid leaks around the cylinder rod or sluggish boom movement when these seals begin to fail.

Boom Cylinder Seal Kit – Part No 259-0634 – 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, PTFE, metal
ApplicationBoom cylinder sealing
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Visible hydraulic fluid leaks around the boom cylinder rod are the first sign of seal failure. If left unaddressed, the leaks will worsen, leading to a gradual loss of hydraulic pressure and slower boom response. Continued operation with compromised seals can result in increased wear on cylinder components and potential system downtime.

Installation Tip

Ensure the cylinder bore is meticulously clean before installing new seals to prevent premature wear. Avoid using sharp tools that could nick or damage the delicate sealing surfaces during installation.

Service Note

Inspect the cylinder rod for any scoring or damage, and clean the cylinder bore thoroughly before installing the new seal kit.