3085794 Original Excavator Swing Motor Drive Shaft for ZX110 

The Hitachi original excavator rotary motor drive shaft (universal part number: 3085794) is the core transmission component that connects the hydraulic motor and the reduction gear in the rotary mechanism. The original spare parts are clearly compatible with Hitachi ZX120, ZX130-5A and other models of excavators. Based on extensive accessory information, it may also be applicable to numerous models across multiple Hitachi series, including ZX60、ZX70、ZX110、ZX160LC-3、ZX180LC-3、ZX200-3、ZX210LC-3、ZX225US-3、ZX240-3、ZX250LC-3、ZX270、ZX330、ZX360LC、ZX450、ZX470、ZX870 Waiting for ZX series, as well as corresponding EX series (such as EX60-3, EX200 series, etc.).

One end of the transmission shaft is connected to the motor rotor through a spline or flange, and the other end meshes with the input gear of the reducer. Its manufacturing precision is extremely high, ensuring a perfect fit with bearings, seals, and gears, thereby reducing vibration and noise, and ensuring smooth and efficient rotation. The original transmission shaft undergoes strict heat treatment and dynamic balance testing, and can maintain stable mechanical performance under continuous alternating loads, which is the foundation for reliable operation of the rotary system.

The maintenance of the drive shaft of the rotary motor is closely related to the maintenance of the entire rotary mechanism. Firstly, it is necessary to strictly replace the hydraulic oil and gear oil of the rotary reducer according to the maintenance cycle. It is recommended to replace the hydraulic oil about every 2000 hours and the gear oil about every 1000 hours, and use oil products that meet the original factory standards. This is the key to preventing internal wear. Secondly, it is necessary to regularly (approximately every 250 hours) add lubricating grease to the rotary bearings through a dedicated grease nipple. When adding grease, the upper body of the vehicle should be slowly rotated to ensure even distribution, but excessive filling should be avoided to prevent damage to the sealing ring.