CATEngine Parts

266-7874 Stick Cylinder Seal Kit — Cat 3046 315C

This stick cylinder seal kit is designed to replace the worn seals within the hydraulic stick cylinder, preventing fluid leaks and maintaining proper hydraulic system pressure. It is constructed from high-quality sealing materials that resist wear and degradation, unlike failed seals which allow hydraulic fluid to escape. Operators may observe a slow or jerky movement of the stick, external hydraulic fluid leaks around the cylinder, or a loss of lifting/digging power if this seal kit is compromised.

Stick Cylinder Seal Kit – Part No 266-7874 – 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
ApplicationExcavator stick cylinder
Service LifeReplace as needed based on operating hours and conditions
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of failing stick cylinder seals is often a slight external hydraulic fluid leak around the cylinder rod or slower-than-normal stick operation. If ignored, the leaks will worsen, and the cylinder's performance will degrade further, leading to reduced digging force and potential system contamination. Continued operation risks significant hydraulic system damage and operational downtime.

Installation Tip

Thoroughly clean the cylinder bore and piston rod, removing all traces of old seal material and debris. Ensure new seals are properly lubricated with system-compatible hydraulic oil before installation to prevent tearing.

Service Note

Inspect the cylinder rod for scoring or pitting, and check the hydraulic fluid for contamination when replacing stick cylinder seals.