4069801 Original Excavator Pipe Coupling for Hitachi ZX200-5G

Part number 4069801 is an original ultra-high pressure pipe joint specially designed by Hitachi for the ZX200-5G hydraulic excavator. Its universal model is the part number itself, which is dedicated to connecting ultra-high pressure (160MPa and above) oil circuits of hydraulic systems (such as main pumps and main valves). As the core connector of the original factory, its thread specifications (such as M22 × 1.5 or M24 × 1.5), sealing cone angle, and corresponding interface are completely matched

This product is a precision machined tapered threaded straight joint made of high-strength alloy steel, with a silver gray overall color. Key markings such as "NH1000HN", "M1600-125", "R", and "HN100085125" are clearly engraved on the central main cylinder. Among them, "M1600-125" directly indicates that its nominal pressure is 1600 kgf/cm ² (about 157MPa), and "R" usually represents the taper pipe thread. The two ends of the joint have internal and external threads respectively, and are designed with 24 ° or 74 ° sealing cone surfaces to ensure metal metal hard sealing under ultra-high pressure without the need for additional sealing rings. Its material and process are specially designed to withstand high-pressure impact and pulse fatigue of hydraulic systems, and it is the core component that ensures absolute sealing in ultra-high pressure circuits.

Installation specifications (safety and cleanliness are key): 1 Inspection: Before installation, use a magnifying glass to check for any bumps, scratches, or rust on the joint threads and sealing cone surfaces. 2. Cleaning: Use specialized cleaning agents and lint free cloth to thoroughly clean the threads and sealing surfaces of the joints and components to be connected. 3. Align and screw in: First, manually screw the joint into the first thread to ensure that the thread is easily aligned and free of jamming. It is strictly prohibited to forcefully screw in. 4. Torque tightening: A calibrated torque wrench must be used, and the torque specified in the maintenance manual (the joint torque for this pressure level is usually 100-150 N · m or higher) must be tightened in one go. After tightening, the identification line on the joint should be in a position that is easy to observe.