Activate the pneumatic reversing valve to raise the cylinder, causing the lifting device to lower and fix the height of the big bag. After securing it, reverse the valve to lower the cylinder, tightening the big bag. Reduce the counterweight to lower the loader into the big bag for material suction. As suction continues, the bag gradually loses weight until it is lighter than the tightening force. The bag then lifts, allowing the remaining material to be sucked. Once the cylinder reaches its limit and triggers the sensor, the alarm lights up, indicating the suction is complete.