CATEngine Parts

215-9999 Boom Cylinder Seal Kit — Cat C18

This is a comprehensive boom cylinder seal kit, containing all necessary seals and O-rings to rebuild a hydraulic boom cylinder and prevent fluid leakage. It is manufactured to meet OEM specifications for durability and sealing performance, ensuring proper cylinder function unlike a worn or damaged seal. Symptoms of failing seals include hydraulic fluid leaks from the cylinder, slow or jerky boom movements, or a loss of lifting capacity.

Boom Cylinder Seal Kit – Part No 215-9999 – 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, Polyurethane
ApplicationBoom cylinder sealing
Service LifeReplace as needed based on inspection
CompatibilityCAT 345B, 345C, 345D, C18, 385B
ConditionNew — OEM specification aftermarket

Failure Symptoms

The initial sign of failing boom cylinder seals is often visible hydraulic fluid leakage around the cylinder rod or barrel. If left unaddressed, this leakage can lead to a gradual loss of hydraulic pressure, causing the boom to drift or move erratically. Continued operation with compromised seals risks significant hydraulic system contamination and potential damage to the cylinder bore and rod.

Installation Tip

Carefully inspect the cylinder rod and bore for any nicks, scratches, or burrs before installing the new seals, as these imperfections can cause premature seal failure. Ensure all old seal material is completely removed from the grooves.

Service Note

When replacing boom cylinder seals, it is advisable to inspect the hydraulic fluid for contamination and check the condition of the hydraulic filter.