9724756 Original Excavator Hydraulic Pump Valve Connecting Piece for ZX200-5A

The original hydraulic pump valve connector (part number 9724756) is a key pipeline component in the hydraulic system of Hitachi ZX200-5A excavator that connects the main pump and the multi way valve. It is mainly used for the high-pressure oil circuit connection between the dual variable axial piston pump and the main control valve of the Isuzu GI-4HK1XKSA-02 engine. This connector is also widely used in Hitachi ZX200-5, ZX210-5A, ZX240-5A and other series of 5th generation models, and its universal number 9724756 is its only identification in Hitachi's original accessory system. When placing an order, it is necessary to provide the complete model of the excavator and the serial number of the hydraulic pump for verification to ensure that the interface size matches the sealing form perfectly.

This product belongs to the high-pressure hard pipe or flange connection assembly specialized for construction machinery. It is made of high-strength alloy steel forging body, and the inner wall is treated with phosphating or galvanizing anti-corrosion. The standard working pressure is ≥ 35 MPa and the burst pressure is ≥ 140 MPa. The connection form is SAE flange or JIS four bolt flange, and the sealing method adopts metal gasket or O-ring+retaining ring. The interface specification is usually 1-1/4 "or 32 mm. The total length of the original connection piece is about 300-500 mm, and the bending radius meets the hydraulic pipeline design specification of R ≥ 5D, ensuring long-term resistance to pulse pressure and vibration in the oil temperature range of -30 ° C to+120 ° C. The internal flow channel is polished with a surface roughness Ra ≤ 0.8 μ m to reduce oil flow resistance and local heating.

It is recommended to conduct an inspection every 500 hours of work or every 3 months: use a torque wrench to double check the tightening torque of flange bolts (usually 80-120 N · m), and check whether the sealing gasket/O-ring is crushed or aged. Disassemble the connectors every 2000 hours of work, rinse the inner wall with a high-pressure cleaning machine, and check whether the threads or flange sealing surfaces are scratched or corroded. During installation, it is necessary to use new seals and apply an appropriate amount of lubricating grease. Tighten the bolts in diagonal order in stages.