9260805 Excavator Swing Device Assy for ZX200-3 Hitachi

The Hitachi excavator rotary assembly (part number: 9260805) is the core integrated component that drives the upper platform of the excavator to achieve 360 degree rotation. As a universal design, this assembly is widely compatible with multiple small to large excavators of Hitachi ZX and EX series. Specific applicable models include but are not limited to: ZX60、ZX70、ZX110、ZX120、ZX160LC-3、ZX180LC-3、ZX200-3、ZX210LC-3、ZX225US-3、ZX240-3、ZX250LC-3、ZX270、ZX330、ZX360LC、ZX450、ZX470、ZX870， And EX60-3, EX100, EX200, EX220-2, EX300, EX400, EX550, EX850, EX1100-1200, etc.

The slewing assembly is the core power unit of the excavator slewing mechanism, usually integrated with key components such as the slewing motor, planetary gear reducer (commonly known as the "slewing gearbox"), and slewing support (large gear ring). Its core function is to convert the high-pressure oil of the hydraulic system into powerful mechanical torque, driving the upper working platform to rotate smoothly and accurately. The assembly adopts multiple sealing structures (such as skeleton oil seals and O-rings) inside, which can effectively prevent grease leakage and external mud, water and other substances from entering. The bearing configuration usually adopts a combination of double row tapered roller bearings and four point contact ball bearings, which can withstand the huge axial force, radial force, and overturning moment generated during excavator operation.

The maintenance core of the rotary assembly lies in regular lubrication, inspection of seals, and tightening of bolts. Lubrication is crucial, and it is necessary to add the designated No.2 extreme pressure lithium based grease through the grease fitting on the slewing bearing every 50-100 working hours. When adding, slowly rotate the upper platform to ensure that the grease is evenly filled in the raceway until a small amount of new grease overflows from the edge of the sealing ring. Sealing inspection should be conducted weekly to observe whether the internal and external oil seals have cracks, damage, or severe oil leakage. Once discovered, they should be replaced immediately to prevent contaminants from entering and causing early wear of bearings and gears. Bolt tightening is crucial, and the pre tightening torque of all installed bolts should be checked after the first 100 and 500 hours of equipment operation,