1. Before uncovering the inlet of the feed tank, the sewage suction truck needs to open the pressure relief valve to discharge the excess air in the tank; 2. Clean the tachometer probe right away; 3. Check the safety valve to ensure that the exhaust starts at 0.196MPA, and the pressure in the tank must not exceed 0.16MPA; 4. Check whether the sprinkler tachometer is working properly, so as not to damage the ball air compressor and power take-off due to overturning; 5. Pay attention to whether the pressure gauge of the sprinkler is working normally, and prevent the pressure gauge from malfunctioning and overpressure explosion; 6. Listen to the sound of the air compressor rotating from the power take-off of the sewage suction truck. If the sound is abnormal, stop the machine immediately to eliminate the fault. Matters needing attention in the use and maintenance of sewage suction truck: 1. No air leakage is allowed in the pipeline of the sewage suction t...