CATEngine Parts

349-4119 Boom Cylinder Seal Kit — Cat 312D 312E

This is a hydraulic cylinder seal kit designed to maintain pressure and prevent contamination within the boom cylinder assembly of heavy equipment. It is manufactured to meet stringent OEM quality standards, ensuring superior sealing performance compared to worn or damaged seals that allow fluid leakage and ingress of debris. Operators may notice a loss of lifting power, slow boom movement, or visible hydraulic fluid leaks around the cylinder when these seals begin to fail.

Boom Cylinder Seal Kit – Part No 349-4119 – 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 metal components
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 sluggishness in boom operation or minor external fluid seepage. If ignored, the leakage will worsen, potentially leading to a significant loss of hydraulic pressure and reduced lifting capacity. Continued operation with failing seals can lead to internal cylinder damage and contamination of the entire hydraulic system.

Installation Tip

Thoroughly clean the cylinder bore and rod before beginning to prevent dirt from damaging the new seals. Avoid using sharp tools that could nick or scratch the sealing surfaces during installation.

Service Note

Inspect the cylinder rod for any scoring or damage that could compromise the new seals' effectiveness.