sprayer problems

Anonymous-0 · Apr 4, 2010

i'm having a problem with a john blue 4400 series piston sprayer pump,i rebuilt it last season due to leaking oil seals, i installed new connecting rod and complete seal kit. i could not calibrate it with the slide rule used for this pump, so i used the ounces per nozzle delivered in 1/10 acre travel distance, set it at 20 gpa worked fine until this year, i wanted to apply 30 gpa ,i set the pump to deliver 32 ounces per nozzle, 12 nozzles on the booms spraying a 36 foot swath 121 feet long,at jogging speed we would catch 32 ounces per nozzle in a measuring cup ,the first i sprayed i got 23 gpa, my question is what could be the problem i've rechecked all my measurements there ok, still don't understand why this pump can't be calibrated with the slide rule, thanks for any help.

JD Seller · Apr 4, 2010

The problem might be that your nozzles aren't big enough for the flow you want. The pump maybe raising the flow/pressure but if the nozzles won't handle that much the pressure the relief valve would just send it back to the tank. As for your slide rule they only work for a certain size nozzle or orifice.

grazer2 · Apr 5, 2010

I've found that to with my Hardi sprayer the best that I can come up with is that the slide rule is for perfect conditions. Which with sprayers there can be millions of variables

JBMac · Apr 5, 2010

There are so many components on a sprayer, valves wear, nozzles wear even partial obstructions in the lines make a difference. Your calibration method is most accurate, it tells you what the sprayer is actually doing, compared to what it "should" be doing.

sprayer problems

Anonymous-0

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JD Seller

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grazer2

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JBMac

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