CATEngine Parts

350-0973 Boom Cylinder Seal Kit — Cat 320D

This boom cylinder seal kit is essential for maintaining hydraulic system integrity, preventing fluid leaks and ensuring proper operation of the boom function. Manufactured to meet strict OEM quality specifications, these seals provide a durable barrier against contamination and pressure loss, unlike worn or damaged seals that allow hydraulic fluid to escape. Operators may experience slow or jerky boom movements, external hydraulic fluid leaks around the cylinder rod, or a noticeable loss of lifting power when this kit fails.

Boom Cylinder Seal Kit – Part No 350-0973 – 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
ApplicationBoom hydraulic cylinder
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing boom cylinder seal kit is often visible hydraulic fluid leakage around the cylinder rod or at the cylinder end caps. This leakage can lead to a gradual loss of hydraulic pressure, resulting in slower, less responsive, or jerky boom movements. If left unaddressed, significant fluid loss can cause system overheating, pump damage, and a complete inability to operate the boom.

Installation Tip

Thoroughly clean the inside of the cylinder bore and the piston rod before installing the new seals to prevent damage. Ensure all seals are properly seated and oriented according to the service manual instructions to prevent immediate leakage.

Service Note

Inspect the cylinder rod for scoring or damage and check the hydraulic fluid level and condition when replacing the boom cylinder seal kit.