CATEngine Parts

331-9328 Bucket Cylinder Seal Kit — Cat C13 C18

This is a seal kit specifically designed for the bucket cylinder of heavy equipment, containing all necessary seals and O-rings to rebuild the hydraulic cylinder. It is manufactured from high-quality materials that resist wear and hydraulic fluid degradation, providing a superior seal compared to a worn or cracked original seal. Operators will typically observe hydraulic fluid leaks around the cylinder rod, sluggish or jerky bucket movement, or a loss of hydraulic pressure when this seal kit fails.

Bucket Cylinder Seal Kit – Part No 331-9328 – 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
ApplicationBucket Cylinder
Service LifeReplace when cylinder shows signs of leakage or performance degradation
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of seal failure is often visible hydraulic fluid leakage from the cylinder rod seal or around the cylinder body. If not addressed, the leakage will increase, leading to slower and less responsive bucket operation. The ultimate consequence is a significant loss of hydraulic system pressure, rendering the bucket unusable and potentially causing damage to other hydraulic components.

Installation Tip

Thoroughly clean all internal surfaces of the cylinder bore and piston before installing the new seals to prevent damage. Ensure all seals are properly seated and lubricated before reassembly to avoid tearing.

Service Note

When rebuilding a hydraulic cylinder, inspect the cylinder barrel for scoring and the piston rod for straightness and damage.