Material Rate User Manual
411-020B Table of Contents 2014-03-17
76 1625AHD/AHL Table of Contents Great Plains Manufacturing, Inc.
Dry Fertilizer Rates
This section covers application of granular dry fertilizer
from the central hopper of 1625AHD models.
Refer to Figure 17
The dry fertilizer system is powered by a dedicated
ground drive wheel , which has a lock-up capability, but
no rate adjustments in the ground drive assembly.
Coarse fertilizer rate is set by Range gears on the
right side of the meter.
Fine rate is set by a crank adjuster on the variable rate
gearbox.
A second crank , is used for system calibration.
There are four steps to obtaining the target weight of
fertilizer kg per hectare (or pounds per acre):
1. Find your target rate in the charts beginning on
page 82. If your rate is available on both the High
Range and Low Range chart, for most consistent
results, pick the chart that results in a variable rate
gearbox value between 30 and 70.
2. If you know the density of your material, compare it
to the material used to develop the chart. If they
differ by more than a few percent, you may want to
start with a different chart rate (see “Density
Adjustment” on page 78).
3. Set the Final Drive Range on the meter (page 77).
4. Set the Variable Rate Gearbox (page 77).
5. Calibrate. See “Fertilizer Meter Calibration” on
page 78.
Note: The PM400 monitor can report blockage of fertilizer
flow at the rows, and shaft under/over-speed, but
does not measure rate.
Reading a Dry Fertilizer Rate Chart
a. Choose the Low or High Range chart, favoring the
chart which places your initial adjuster setting closer
to the center of the 30 to 70 scale.
b. Note the final Range gear sprocket combination.
c. Note the reference Material Density. If your material
density is significantly different from the reference
material, a Density Adjustment may save time.
d. Find your target field application rate in kilograms per
hectare or pounds per acre. If using a Density
Adjustment, you’ll use different target rate to begin
calibration.
e. Note the suggested initial gearbox setting.
Figure 17
Dry Fertilizer System, Bottom View
34499
3
2
4
1
1
2
3
4
Final Drive Range Gears Mate
r
Low Range 0.9
17T Driving; 54T Driven 60.0 poun
d
a
b
Material Density
Mod
e
0.96 kg/liter
60.0 pounds per cubic foot
c
Material Rate
kg/ha lbs/ac
56.2 50.2 73
57 5 51 3 74
x
g
Gearbox
Setting
d
e