Piston Pump Setting Calculations
Use the following formulas to calculate the correct pump setting for a pump and drive setup:
Note: Pump RPM cannot exceed 350 RPM. Dial setting needs
to fall between 2 and 10, or drive sprockets need to be changed.
G-1000 Series 1 RPM = .076 Gal per minute (full stroke)
G-2000 Series 1 RPM = .152 Gal per minute (full stroke)
Swath width in feet DIV 16.5 x 2 x mph x desired rate per acre DIV 60 minutes = Gallons per minute required.
MPH x (A) teeth on wheel sprocket x 336 x Drive (M) DIV (B) wheel diameter x (C) teeth on pump x Driven (K) x output per RPM = Maximum Output per Min
Gallons per minute required (Step 1) DIV Maximum Output per Minute (Step 2) = Dial setting on pump
Example, Pump G-1000 Series
For a 21 foot swath running at 5 mph, at 10 gallons per acre, and with your drive as follows: (in reference with the above illustration and a 28" Diameter wheel, A=15, K=20, M=40, and C=18 teeth).
21 ft. DIV 16.5 x 2 x 5 mph ÷ 60 min x 10 GPA = 2.1 gal per minute required.
5 x 15 (A) x 336 x 40(M) DIV 28 (B) x 18(C) x 20(K) =1008000 DIV
10080 = 100 x .076 = 7.6 gal per minute.
Needed: 2.1 GPM DIV Fullstroke: 7.6 GPM = .276 Dial Setting
To get to Gallons per Acre, take the desired rate per acre divided by dial setting:
10 (desired rate) DIV .2763 (dial setting) = 36.19 (max gallons per acre or 10 on the pump).
36.19 x .9 = (32.5 gallons per acre on dial setting 9). 36.19 x .8 = (28.9 gallons per acre on dial setting 8). 36.19 x .7 = (25.3 gallons per acre on dial setting 7), etc.