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Faunsdale, AL | The hydraulics are probably going to get hot pretty quickly. Most pumps like that have a bypass screw on the hydraulic motor circuit to bypass some flow to keep the open center tractor hydraulic system from opening its high pressure bypass all the time. Look for a setscrew with a jamb nut that will need to be backed out until you get the pump rpm you need for spraying and agitation. The JD hydraulics he was using are closed center and the bypass screw should have been closed for either of those tractors.
Once you get that set so you have plenty of flow for agitation and still maintain spray pressure at the engine rpm you will be running, then pick a transmission gear that will give you the ground speed you want. Once you know ground speed you can select tips and set spray pressure to get the desired gpa.
That control may be a pressure regulator, don't know. If it is then you don't need the spray bypass valve linked to earlier. The pump you have is a centrifugal type that will not build dangerous pressures like a positive displacement piston, diaphragm or roller pump. You can simply restrict the outlet of the centrifugal pump with a valve or shut bypass valves etc if you want to prevent foaming etc. It will always be good to keep a minimum flow through the pump to keep the seal cool, but if its causing foaming etc, cut it back.
Commonly sprayer booms are set up on 15 or 20 inch spacing. Most tip charts are for 20" but can be converted to whatever you want. I question if you will have good coverage with 80° tips on 30" spacing. Booms will need to be running high!
Just to throw out some tips, if you stay with the 06 tips at 20" spacing to get down to 20 gpm you would need to run less than 20 psi at 6 mph. If you stay on 30" spacing you can get that rate at 40 psi at 6 mph.
Link to tip chart.......
http://www.spraysmarter.com/media/description_images/xr.jpg
Edited by ccjersey 7/24/2016 17:03
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pull-type sprayer with hydraulic pump
