504A. According to the data of Che Huang, the engine power of Huaxia 504A is 50 HP, and the driving form is 4 times 4, which is the best configuration in this series. Huaxia tractor is a multifunctional tractor designed by Weifang Huaxia Tractor Manufacturing Co., Ltd. for greenhouse planting and garden management, which has the functions of ordinary tractors.