CATEngine Parts

375-0740-375-0741 Arm Cylinder Seal Kit — Cat 306 306E

This is an arm cylinder seal kit designed for CAT C2.6 and C2.4 excavators, containing all necessary seals to rebuild the hydraulic arm cylinder. It is manufactured to meet original equipment quality, ensuring proper sealing and preventing hydraulic fluid leaks that a worn kit would allow. Operators may notice slow or jerky arm movements, external fluid leaks around the cylinder, or a loss of hydraulic pressure when this kit fails.

Arm Cylinder Seal Kit – Part No 375-0740-375-0741 – 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 polyurethane
ApplicationHydraulic arm cylinder
Service LifeReplace when cylinder shows signs of leakage or performance degradation
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The initial symptom of a failing seal kit is often a visible hydraulic fluid leak from the arm cylinder rod. If left unaddressed, the cylinder will lose pressure, leading to sluggish or erratic boom and stick movements. Eventually, the cylinder may fail to hold its position, posing a risk to operational stability and control.

Installation Tip

Carefully inspect the cylinder rod and bore for any scoring or damage before installing new seals, as imperfections can cause immediate leaks. Ensure all seals are properly seated and lubricated with clean hydraulic fluid to prevent tearing during assembly.

Service Note

Inspect the hydraulic fluid level and condition, and check the hydraulic pump for proper operation when replacing an arm cylinder seal kit.