0656604 Boom Swing Cylinder Seal Kit for Hitachi EX40U EX50U Excavator

Premium 0656604 Boom Swing Cylinder Seal Kit for Hitachi Excavators

Eliminate hydraulic fluid leaks and restore precise left-to-right boom articulation with the WINSCHEN premium 0656604 Boom Swing Cylinder Seal Kit. Engineered specifically to withstand the frequent operational movements, high fluid pressures, and rugged environments of tight-space trenching and utility earthmoving, this high-quality aftermarket repair kit ensures your Hitachi compact equipment operates safely and efficiently with zero pressure loss.

Key Features and Selling Points

• Manufactured to strict OEM dimensions, ensuring a precise and seamless fit for the boom swing (offset) hydraulic cylinders (including cylinder assembly 4392050) used in Hitachi EX40U, EX50U, and EX50UNA series compact excavators.
• Constructed from advanced elastomeric, polyurethane, and heavy-duty wear-resistant materials to provide exceptional resistance to high hydraulic pressure spikes, continuous rod friction, and extreme thermal variations.
• Effectively eliminates internal fluid bypass and external leakage, preventing boom drift during complex offset digging tasks and maintaining highly responsive, consistent mechanical control.
• This comprehensive seal kit includes all essential precision components—such as U-rings, wiper rings, cushion rings, slide rings, back-up rings, and O-rings—required for a complete and reliable cylinder overhaul, directly replacing part number 0656604.
• A cost-effective, highly reliable aftermarket alternative that meets or exceeds original equipment standards, minimizing your machine’s routine maintenance downtime and maximizing on-site productivity.

Compatible Equipment Models

Based on official catalog and parts cross-reference data, the 0656604 seal kit services the boom swing cylinders of the following Hitachi equipment:

• Mini Excavators: EX40U, EX50U, EX50UNA
• Application: Boom Swing / Offset Cylinder Hydraulic Service & Rebuild

Specifications

To guarantee 100% fitment, please verify your machine’s model, serial number, and original cylinder configuration with our dedicated support team prior to purchasing. We proudly offer fast and reliable global shipping to keep your compact equipment running smoothly.