Great Plains 1300 13-Foot Material Rate - Manual (Page 24)

22 1300 and 1300F Table of Contents Metric Charts Great Plains Manufacturing, Inc.
175-157B Table of Contents Metric Charts 2014-03-10
Setting Fertilizer Transmission
Refer to the Fertilizer Rate Chart on page 25 to find the
correct Transmission (Driver/Driven) sprocket sizes for
your drill’s row spacing and target (or adjusted)
application rate.
Refer to Figure 14
To change the Transmission setting:
Loosen idlers and slide idler sprockets out of
engagement with chain.
72. Remove linch pins from both sprocket shafts, and
remove sprockets.
73. Place correct Driver and Driven sprockets on their
respective shafts.
74. Store sprockets not used on ends of shafts. Re-
install pins.
75. Reinstall chain and engage idlers, allowing
1 ⁄
4
inch
(6.4 mm) slack in the top chain span.
76. If this is the final setting, after calibration, repeat
step through step 65 for the right drill section.
Fertilizer Rate Calibration
Differences will exist between the tested fertilizer and
field conditions used to generate the Rate Chart, and
your fertilizer and conditions. To accurately achieve your
target application, Great Plains recommends calibrating.
Perform the calibration with the opener frames lowered
(if the openers are raised, the clutch disengages). Leave
the tractor hitched for movement control.
Estimate the sample sizes.
Take your planned application rate (in our example,
78 pounds per acre
and divide it by the row count of your drill
21 in our example.
The expected sample size is 4.8 lbs per row, or
14.3 pounds for 3 sample rows.
77. To perform this calibration, you need a scale that is
accurate near the aggregate sample size, and 3
light-weight containers, each capable of holding a
row’s sample.
78. Disengage the lock-out hub (see Operator Manual),
to permit independent rotation of the main jackshaft.
Refer to Figure 15
79. Remove the calibration crank from its storage stob
on the left top side of the main toolbar. Store the
retaining pin on the stob.
Refer to Figure 16
80. Place the hex socket of the crank on the left end of
the main jackshaft.
Figure 14
Fertilizer Final Drive
17049
1
2
2
DRIVER
DRIVEN
1
2
Figure 15
Calibration Crank Stored
16651
Figure 16
Calibration Crank Engaged
16652