3520020050 Original Loader Stator for 85ZV-2 90Z4-2 90ZV

The stator (guide wheel) with part number 3520020050 is the core component of the hydraulic torque converter. After investigation, no direct official association record between the part number and the original parts of Hitachi loaders was found in the public information. In the field of construction machinery parts, this number may be a universal stator part number for torque converters, commonly used in various brands of 5-ton wheel loaders that use single-stage three element hydraulic torque converters. If used as a "Hitachi original" accessory, it may be compatible with large wheel loaders in the Hitachi ZW series, such as ZW180, ZW220, ZW250, ZW310, ZW330, ZW370-G, ZW550-G, and other models.

The stator (guide wheel) is a key stationary component for torque amplification in hydraulic torque converters. It is usually precision cast from high-strength aluminum alloy or special cast iron, and the blades are designed with fluid dynamics optimization to have specific curved surfaces and inlet angles. Its core function is to change the direction and speed of the oil flowing out of the turbine, guiding it back to the inlet of the pump wheel. In this process, it generates a reaction torque on the oil, which is combined with the torque of the pump wheel and transmitted to the turbine, thereby significantly increasing the output torque during machine start-up and heavy load. In a twin turbo torque converter, it may involve the coordination of two guide wheels and a overrunning clutch.

As a precision component inside the torque converter, the maintenance core of the stator lies in ensuring exceptional system cleanliness, regular maintenance, and professional diagnosis. Oil management: It is necessary to use hydraulic transmission oil of the specified model and grade (such as No. 8 or designated model), and strictly replace the oil and filter according to the maintenance cycle (usually every 1000-2000 working hours). Oil contamination is the main cause of stator blade cavitation and wear. If it is necessary to replace the stator, the torque converter assembly must be sent to a professional repair shop for disassembly, cleaning, testing, and dynamic balance correction.