The utility model belongs to the technical field of
agricultural machinery transmission systems, and particularly relates to a front drive axle
assembly of a hydraulic stepless speed change harvester, which comprises a gearbox body, a first shaft, a second shaft, a third shaft, a
left half shaft and a right half shaft of a differential
assembly are rotatably connected in the gearbox body, and the first shaft is in transmission connection with an output end of a hydraulic stepless speed change motor. The first shaft is sleeved with a first shaft gear A, the second shaft is sleeved with a first-stage
speed reduction driven gear, the second shaft and the third shaft are in transmission fit through a gear position gear
assembly, the third shaft is sleeved with a third shaft gear A, a
left half shaft and a right half shaft of the differential mechanism assembly are in transmission connection with the
tail end transmission box assembly, and one end of the third shaft extends out of the gearbox body to form a four-
wheel drive reserved end. According to the utility model, a transmission mechanism which is driven by the hydraulic stepless variable-speed motor and is provided with multi-gear speed change is adopted, so that the requirements of simple operation and stable and
reliable transmission are met, and a four-wheel-drive reserved end which can be in transmission fit with a four-wheel-drive
transfer case is reserved, so that the complete
machine can be ensured to have enough driving force.