The design and fabrication of manually operated pesticide sprayer. Sprayer consists of back pack sprayer which is mounted on the tank base of the trolley. The piston rod of the tank is connected to the crank, which is mounted on the smaller gear, which in turn is meshed with a larger gear; the larger gear is mounted on the trolley. The pump is connected to the pressure tank, which pressurizes the fluid during operation and stores in the pressure tank...