CATEngine Parts

137-3763 Boom Cylinder Seal Kit — Cat 320C

This boom cylinder seal kit is designed to maintain hydraulic pressure and prevent fluid leakage within the boom cylinder assembly, a crucial part of the excavator's lifting and positioning system. Manufactured to meet strict OEM specifications, these seals offer superior resistance to wear and hydraulic fluid degradation compared to worn or damaged seals. Operators may observe a slow or jerky boom movement, external hydraulic fluid leaks around the cylinder, or a loss of lifting capacity when this seal kit fails.

Boom Cylinder Seal Kit – Part No 137-3763 – 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 TypeBoom Cylinder Seal Kit
MaterialNBR rubber, polyurethane
ApplicationHydraulic boom cylinder
Service LifeReplace as needed, typically 2,000-4,000 hrs
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing boom cylinder seal kit is often a visible hydraulic fluid leak from the cylinder rod. This can progress to sluggish or jerky boom operation and a reduction in the cylinder's ability to hold its position under load. If left unaddressed, significant fluid loss can lead to system overheating and potential damage to the hydraulic pump and other components.

Installation Tip

Carefully clean the cylinder bore and rod before installing the new seals to prevent damage and ensure a proper seal. Ensure all seals are oriented correctly according to the service manual to prevent immediate failure.

Service Note

Inspect the cylinder rod for any scoring or pitting, and check the hydraulic fluid level and condition during seal kit replacement.