Suction truck maintenance of the vacuum pump 1, after a period of time, add a certain amount of oil in the vacuum pump inlet, and then turn the pump up, the oil is drawn in to lubricate the parts inside 2, the exhaust time longer Troubleshooting: A, check the sealing of the interface B, check the feed inlet is plugged C, check the inlet exhaust spring is loose (if slack then elongated, size requirements: the spring size than the wire through the hole slightly higher)