CATEngine Parts

324-0399 Hydraulic Boom Cylinder Seal Kit — Cat 422E 422F

This is a Hydraulic Boom Cylinder Seal Kit designed to replace worn seals within the boom cylinder assembly of CAT equipment. It is manufactured to meet stringent OEM quality standards, ensuring a reliable seal that prevents hydraulic fluid leakage and contamination, unlike degraded seals that allow fluid loss and dirt ingress. Operators may notice a loss of boom control, slow or jerky cylinder operation, or visible hydraulic fluid leaks around the cylinder rod when this seal kit fails.

Hydraulic Boom Cylinder Seal Kit – Part No 324-0399 – 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 components
ApplicationHydraulic boom cylinder
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of failure is often a slow drift of the boom when not actively being controlled. If ignored, the cylinder will lose hydraulic pressure more rapidly, leading to sluggish and unpredictable boom movements. Continued operation with leaking seals can result in internal cylinder damage and potential loss of hydraulic system efficiency.

Installation Tip

Ensure the cylinder bore and rod are meticulously cleaned before assembly to prevent new seal damage. Avoid using sharp tools when seating the seals, as this can easily cause nicks and tears.

Service Note

Inspect the hydraulic fluid for contamination and check the condition of the cylinder rod for any scoring or wear.