CATEngine Parts

259-0625-188-4177 Boom Cylinder Seal Kit — Cat 3126 3126B

This is a Boom Cylinder Seal Kit designed to maintain hydraulic pressure and prevent contamination within the boom cylinder assembly of heavy equipment. It is manufactured to meet stringent OEM standards, ensuring superior sealing performance compared to worn or damaged seals that allow fluid leakage and ingress of dirt. Operators may notice a gradual loss of boom control, slow or jerky cylinder movement, or visible hydraulic fluid leaks around the cylinder rod as the seals begin to fail.

Boom Cylinder Seal Kit – Part No 259-0625-188-4177 – 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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Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

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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 and high-density polyurethane
ApplicationBoom cylinder hydraulic system
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of failure include a slight drift in the boom when holding a position or minor external fluid leakage. If ignored, the leakage will increase, leading to sluggish boom response and potential system contamination. Continued operation with failing seals can result in premature wear on cylinder components and hydraulic pump strain.

Installation Tip

Ensure the cylinder bore and rod are meticulously cleaned to prevent damage to the new seals during installation. Avoid using sharp tools that could nick or scratch the delicate sealing surfaces.

Service Note

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