Great Plains CDS-JohnBlue NGP Series Pumps - Manual (Page 8)

© 2013 CDS-John Blue Co. 8
INITIAL PUMP START UP
Verify that all installation guidelines have been followed as outlined in the installation section of this manual.
 Fill the tank full of water to test for leaks in the plumbing system and output of the pump.
 Fully open the valve at the tank allowing water to fill the suction line and check for leaks.
 Set the pump to pump setting 10.
 Before installing nozzles or orifices (if used), prime the pump and purge the system of air and foreign
material by slowly pulling the applicator 100 to 200 yards.
 Turn off the valve at the tank, open strainer, check for foreign material and clean the screens.
 The CDS – John Blue flow divider is automatic and requires no calibration; however, if nozzles or orifices
are used, verify that the orifices are sized properly as to not produce high discharge pressure.
 Pull the machine over known acreage and verify the application accuracy with water prior to field
application of chemical. Note that tank level marks can give false readings if read on uneven ground.
PUMP CALIBRATION
The NGP pump is calibrated from the factory; however, if the setting scale, hub, or pointer is replaced, use the
following procedure to calibrate the pump output with scale readings.
 Remove the valve cover and outboard cylinder (see maintenance section).
 Set the pump on pump setting 5 for all pump sizes.
 Rotate the crankshaft until the piston is as far in as it will go. Measure the distance from the end of the
piston to the inboard cylinder flange. Rotate the crankshaft until the piston is as far out as it will go and
measure again to the same place. The difference in length is the stroke length, which at pump setting
5 should be 9/16” for the NGP-4050, 5050, 6050, & 8050, or 15/16” for the NGP-7050 & 9050.
 If the distance is less than the required amount, reset the pointer at a higher setting, if it is greater; reset
the pointer at a lower setting. Repeat this procedure to obtain the required measurement.
 Once accomplished, loosen the setting scale screws until the 5 is directly under the pointer and secure the
scale in position with the three scale screws.
 Replace the outboard cylinder and valve cover, making sure that the valves are in their proper orientation
as covered under the maintenance section.
PUMP ACCURACY
A catch test may be performed to verify accuracy (not as a calibration method) by priming the pump and
catching all of the pumped fluid from the discharge for a known number of revolutions. See chart below:
Pump Series Pump Setting # of Revolutions Total Pump Output
NGP-4050 8-1/4 10 1-1/2 Pints
NGP-5050 8-1/4 10 3 Pints
NGP-6050 8 10 3 Pints
NGP-7050 8-1/4 10 5 Pints
NGP-8050 8 10 6 Pints
NGP-9050 8-1/4 10 10 Pints