Check the filter size to make sure product can flow easily, open the ball valve and check for
leaks. Before going to the field, always check the rates as there can be variables that can cause a
difference between calculated rates and actual rates.
8. Hydraulic Pumps
Tractor hydraulics can be used to power the John Blue Squeeze Tube Pumps. Hydraulic pumps
come with the hydraulic motor and control valve, which is connected with standard hose and
fittings. There are many power take-off options associated with different tractor manufacturers
so it is best to consult your local tractor supplier for proper installation.
MAINTENANCE
When the pump is not in use, always take the tension off the tubes by releasing the latch. See
#7, Tube Tension Adjustment instructions.
DRIVE FACTOR EQUATIONS
The information and charts are provided to assist you in the initial set up of your squeeze tube
pump. The attached information provides the basic calculations for a squeeze pump
installation. This information is also available online at www.johnblue.com under “Calculate your
Rates.” It is highly recommended that you take advantage of the website to assist you in your
rate calculations.
COMPLETE THE FOLLOWING FOR ALL APPLICATIONS
Row Spacing = actual distance in inches between each point of application.
GPA Desired = amount of material to be applied in gallons per acre (GPA).
Wheel Diameter = ground wheel diameter in inches.
(If using a rub wheel measure the rub wheel diameter.)
Speed = the speed you will be traveling in MPH.
Step 1 Finding Pump RPM
.134 for B pump or
x x .067 for L pump =
Row Spacing GPA Desired RPM of Mainshaft
Example: Row spacing is 12 inches; you want 29 GPA using an “L” pump.
Correct answer: 12 x 29 x.067 = 23 RPM (Round off to whole number)
Never operate the pumps over 100 RPM, this is affected by ground speed; see “Adjustment for
Speed.”
** For Hydraulic Driven Pumps; see “Adjustment for Speed.” **
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