CATEngine Parts

1289278 Arm Cylinder Seal Kit — Cat 330 330L

This is an Arm Cylinder Seal Kit designed to maintain hydraulic system integrity for Caterpillar equipment. It utilizes high-grade nitrile rubber and durable metal components to prevent internal and external leakage, ensuring optimal cylinder performance compared to worn or damaged seals. Operators may notice a gradual loss of hydraulic power, slow or jerky boom/arm movements, or visible hydraulic fluid leaks around the cylinder rod when this kit fails.

Arm Cylinder Seal Kit – Part No 1289278 – 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
MaterialNitrile Rubber, Metal
ApplicationHydraulic Arm Cylinder
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of failure is typically a slow leak of hydraulic fluid from the arm cylinder rod seal. If ignored, the leak will worsen, leading to a noticeable loss of hydraulic pressure and sluggish movement of the arm. Continued operation with a failing seal kit can result in internal cylinder damage and potential hydraulic system contamination.

Installation Tip

Thoroughly clean the cylinder bore and rod before beginning to prevent introducing new contaminants. Ensure all seals are properly oriented and lubricated before insertion to avoid tearing.

Service Note

Inspect the cylinder rod for any scoring or damage, and check the hydraulic fluid for contamination.