4437197 Original Excavator Hydraulic Piston Pump for ZX70

Part number 4330222 is an original rotary hydraulic motor specifically designed for Hitachi EX200-5 20 ton hydraulic excavators, and its internal model may correspond to M2X146. This motor is the core actuator that drives the upper platform of the excavator to rotate 360 degrees. It may also have universality on models of the same series or similar tonnage (such as EX200-3, EX220-5, etc.) that use the same rotary mechanism and hydraulic system. However, due to slight differences in interface size, installation bolt hole position, or control parameters between machines of different production batches or configurations, to ensure 100% compatibility and avoid rotation weakness, abnormal noise, or oil leakage caused by installation mismatch, it is strongly recommended that you conduct final compatibility verification with authorized dealers through the device's body serial number.

This product is a Hitachi original axial piston hydraulic motor, which is the "heart" of the EX200-5 rotary system. It converts the high-pressure hydraulic oil (with a system rated pressure of approximately 34.3 megapascals) delivered by the main pump into powerful mechanical torque, driving the rotary reducer to achieve smooth and precise rotation of the platform. The motor adopts high-strength alloy steel shell and precision ground plunger and distribution plate, with integrated high-pressure rotary seal and relief valve group inside, ensuring high starting torque, low internal leakage and long service life even under harsh working conditions such as frequent forward and reverse rotation and load starting.

Daily inspection and maintenance: Check the motor housing and pipeline joints for oil leakage every shift; Check the gear oil level and quality of the rotary gearbox every 250 working hours; Replace the hydraulic oil and filter element every 1000 hours according to the manual requirements. Operation monitoring: Pay attention to monitoring for any abnormal knocking or friction noise during rotation, observe whether the rotation speed is uniform, and whether there is any jamming or weakness.