What is the reason for the slow rise of hydraulic pressure of Shanghai 50 tractor?

Shanghai 50 tractor is a classic agricultural machinery in the last century, with great contribution and durable leather. After all, the problem of hydraulic lifting is more difficult. The main problem is the gearbox oil used, so many tiny iron pins worn by gears and bearings circulate in the oil, which greatly accelerates the wear of the hydraulic system. After long-term research, I think it is reasonable to change the external hydraulic lifting. If the engine is equipped with an air pump, there is no oil pump connected. Turn the hydraulic oil tank on the fender and press the distributor next to the seat. Then I solved the fundamental problem with the original car cylinder. I sent it to Heilongjiang in the north, Yunnan in Guangxi in the south, Xinjiang, Gansu and Qinghai in the south. Xtep installation is simple, send the kit to guide the installation! Code word (dancing umbrella, wine, demon spirit)