721-98-00420 Arm Cylinder Seal Kit for Komatsu PC290LC-8 PC290LC-11 Excavator

Premium 721-98-00420 Arm Cylinder Seal Kit for Komatsu Excavators

Eliminate hydraulic fluid leaks and restore the heavy-duty digging power of your excavator with the WINSCHEN premium 721-98-00420 Arm Cylinder Seal Kit. Engineered to withstand the extreme operational pressures, heavy payloads, and abrasive environments of large-scale construction and excavation, this high-quality aftermarket repair kit ensures your Komatsu equipment operates safely and efficiently with zero pressure loss.

Key Features and Selling Points

• Manufactured to strict OEM specifications, ensuring a precise and seamless fit for the arm hydraulic cylinders used in Komatsu PC290-8 and PC290-11 series excavators.
• Constructed from advanced elastomeric and heavy-duty PTFE materials to provide exceptional resistance to high hydraulic pressure, continuous rod friction, and extreme thermal variations.
• Effectively eliminates internal fluid bypass and external leakage, preventing arm drift and maintaining responsive, consistent hydraulic digging force.
• This comprehensive seal kit includes all essential components—such as O-rings, wear rings, piston rings, buffer rings, rod packings, and dust seals—required for a complete and reliable cylinder overhaul.
• A cost-effective, highly reliable aftermarket alternative that meets or exceeds original equipment standards, minimizing your machine’s routine maintenance downtime.

Compatible Equipment Models

Based on official catalog and parts data, the 721-98-00420 seal kit services the arm cylinders of the following Komatsu equipment:

• Excavators: PC290LC-8, PC290LC-11, PC290LL-11, PC290NLC-11, PC290LC-11E0, PC290NLC-11E0
• Application: Arm Cylinder Hydraulic Service / Rebuild

Specifications

To guarantee 100% fitment, please verify your machine’s model, serial number, and original cylinder part number with our dedicated support team prior to purchasing. We proudly offer fast and reliable global shipping to keep your projects on schedule.