How to repair the air leakage of fast, small, eight-speed and high-speed inverter

The question you mentioned is very strange. There must be no low speed with high speed, and there must be no high speed with low speed. According to you, high and low grades are not changed occasionally. First of all, you should check the cylinder change behind the gearbox and hang the cylinder head at low speed to see if there is any air leakage. If there is air leakage, it means that the O-ring of the cylinder is worn, and replacement will solve the problem. If it doesn't leak, you need to see where it leaks. Replace the valve if it leaks. Another problem is that the weather is relatively cold recently. In the morning, due to the low temperature, the O-ring in the auxiliary box cylinder is rubber, which will expand with heat and contract with cold, resulting in air leakage in the cylinder, and the air pressure is not enough to push the cylinder. Scald it with hot water and the problem will be solved.