4718274 Genuine Hitachi signal valve for Hitachi ZX330-5A excavator.

This black-label shuttle valve (part no. 4718274) is an OEM-specific component for Hitachi ZX200-5G/ZX330LC-5G excavators, compatible with the model’s hydraulic system circuit. Its core function is to enable one-way conduction and pressure switching of dual hydraulic oil circuits, precisely controlling the action logic of booms, buckets and other actuators, and is a key control element to ensure multi-circuit coordinated operation of the hydraulic system and avoid circuit pressure.

Made of construction machinery-grade high-strength cast steel valve body, the inner wall is precision polished (roughness ≤Ra0.8), paired with high-pressure resistant nitrile rubber seals, which can withstand 35MPa system working pressure. The valve body surface is blackened for rust prevention, adapting to the dusty and humid operating environment of excavators, not easy to rust and jam after long-term use, ensuring the on-off response accuracy and long-term stability of the hydraulic circuit.

Following the original installation interface and torque standards of Hitachi -5G series, it can be directly replaced without additional processing (compatible with the original machine’s sealing gasket), greatly reducing the maintenance time of the hydraulic system. Its stable pressure switching performance can avoid problems such as actuator action stuck and insufficient power, reduce abnormal wear of hydraulic components, and ensure the action fluency and operation efficiency of the excavator during heavy-load operations.