1. Before unloading, check whether the unloading disc valve, external air source interface, exhaust valve and two feed ports are closed and tightened. If not, tighten them first to prevent air leakage;
2. Start the engine and shift the transmission to neutral, and at the same time step on the clutch pedal to completely separate the transmission from the engine;
3. Turn on the power take-off solenoid valve switch, and at the same time slowly release the clutch pedal to make the air compressor rotate;
4. Adjust the control handle of the control mechanism, adjust the speed of the air compressor to about 900r/min, and stabilize it;
5. When the pressure reaches 0.18MPa, first open the auxiliary blow pipe, then open the front and rear warehouse unloading disc valves, and start unloading. After that, the pointer of the air compressor will stabilize at a certain value;
6. When the air pressure drops to 0.04Mpa, the rear warehouse has been unloaded, close the auxiliary blow pipe, open and close the disc valve of the rear warehouse several times, and then close the disc valve of the rear warehouse and the intake valve of the rear warehouse, that is, only the front warehouse is allowed to discharge ,
Thereafter the pressure will rise and stabilize to a certain value;
7. When the pressure of the barometer reaches 0MPa, the unloading is completed, the air compressor is turned off (the power take-off switch is turned off), and the unloading disc valve is closed.