CATEngine Parts

461-0668-461-0669 Arm Cylinder Seal Kit — Cat 305E2 305

This is an arm cylinder seal kit, essential for maintaining hydraulic pressure and preventing leaks within the boom or arm cylinder assembly. Manufactured to precise OEM standards, these seals offer superior resistance to wear and contamination compared to degraded original seals. Operators may notice hydraulic fluid leaks around the cylinder, sluggish arm movement, or a loss of lifting power.

Arm Cylinder Seal Kit – Part No 461-0668-461-0669 – 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, polyurethane
ApplicationExcavator arm cylinder
Service LifeReplace every 1,000-2,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Visible hydraulic fluid leaks from the arm cylinder rod seal are the first indication of a failing seal kit. If unaddressed, the leaks will worsen, leading to a gradual loss of hydraulic pressure and reduced cylinder performance. The ultimate consequence is a significant decrease in the machine's digging or lifting capacity.

Installation Tip

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

Service Note

Inspect the cylinder rod for scoring or damage, and check the hydraulic fluid level and condition.