I have an "estimated" 350 dollars in this sprayer. Time I have no real idea. I work in a manufacturing facility "custom job shop type stuff" so I have access to metal and saws and welders and a good manual mill.I used a mill to machine the boom hinge holes so they would be nice and tight.I also milled the slot in the movable control arm, If I was to do it again I could do it in maybe two eight hour days. I don`t put value on my free time because I love building things.
The control for the booms is mounted on that arm because early on I realized that on most newer tractors, if the control was mounted on the top link post it would be unreachable from the seat. I made it adjustable to fit the two tractors I have access to. J.D.4310 and a J.D.5510 When not being used I can put the arm in a down or "stored"position. The bypass valve and pressure relief valve are located down by the tank because I felt that with the control arm being movable it would get pretty busy if I mounted them on the boom valve.(there are enough ports for the gauge and relief valve but again, I did not want all those extra hoses up top) The aluminum spayer control is available from most farm supply stores (about 60-70 dollars)If you dont want to control the booms separately a on off valve would do
The booms are made from 1" 14 ga steel tubing. The hinges are from 1"x1"1/8 angle.The two angles should be the same or when closed they won`t match. One of mine is off by about a half of a degree and it shows in one of the pictures. Most of the components here are plastic because Roundup/glysophate is pretty corrosive.