9224123 Genuine Hitachi travel motor assembly for Hitachi ZX70 excavator.

Part number 9224123 is a dedicated travel device assembly (including single-speed axial piston motor + two-stage planetary gearbox + drive sprocket) for Hitachi ZX70 excavators, compatible with ZX70, ZX70-HHE, ZX80LCK, ZX80SB-H and other small and medium-sized models. It is suitable for Isuzu 4LE2X engines and original hydraulic systems. The motor has a rated pressure of 32MPa, a maximum torque of 5800N·m, a reduction ratio of 21.5:1, a drive sprocket with a pitch of 190mm and 19 teeth, an input speed of 0-3000rpm, and an output speed of 0-140rpm. The total weight of the assembly is about 120kg. It adopts a floating oil seal (temperature-resistant from -30℃ to 90℃), with a protection class of IP65, and is suitable for the original track assembly, ensuring stable travel power and operation efficiency in small and medium-sized projects.

Its core function is to convert the high-pressure oil output by the hydraulic pump into travel driving force. The two-stage planetary gearbox realizes large torque output. The hydraulic motor has a built-in balance valve (to prevent slope slipping) and an overload relief valve (to protect the system pressure ≤35MPa). The floating oil seal isolates hydraulic oil from gear oil, preventing dust, water and leakage. The gears are made of 20CrMnTi material (carburizing and quenching hardness HRC58-62), and the bearings are original NSK (rated service life ≥10000 hours). It is suitable for small and medium-sized engineering working conditions such as municipal administration and farmland water conservancy (operating temperature -30℃ to 80℃), with an average service life of ≥8000 hours. It has a stable forward-reverse switching function (response time ≤0.6s), ensuring accurate travel actions and reducing component wear.

Before replacement, disconnect the negative pole of the battery and release the pressure of the hydraulic system. When disassembling, remove the fixing bolts with a torque of 100-120N·m, mark the oil pipe interfaces (to avoid wrong connection), and clean the mounting surface (free of oil stains and impurities). When installing, replace with a new floating oil seal (apply grease), tighten the bolts symmetrically (100-120N·m), add gear oil (API GL-5 85W-90) to the oil level line after connecting the oil pipes, and perform a test run (8 minutes each for forward and reverse rotation, no abnormal noise/leakage). This travel device can increase travel traction by 20%, reduce travel failure shutdown rate by 35%, decrease hydraulic oil loss by 12%, extend the service life of tracks and drive wheels, improve the overall operation efficiency of the machine, and reduce maintenance costs.