Small seeds rate calibration – Great Plains 3S-4000HD Assembly Instructions User Manual
Page 27
Great Plains Manufacturing, Inc.
Operations
23
2012-12-11
133-322M
Small Seeds Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Small Seeds Rate
Charts, and your seed and conditions. To accurately
achieve your target population, Great Plains
recommends calibrating.
Perform the calibration with the drill raised for transport,
but with the opener frames lowered (if the openers are
raised, the clutches will disengage). Leave the tractor
hitched for movement control. Block the tires not being
used in the calibration.
If you have previously calibrated your acremeter (see
Operator Manual), you can use it to tally acres.
1.
Jack up the left drive gauge wheel assembly until
the left section is roughly level. Use blocks to ensure
that the section cannot fall if the jack relaxes, tips
over or fails.
2.
Rotate the gauge wheels and check that the drives
and seed cups are engaged, working properly and
free from foreign material. If not already done, set
the Small Seeds Rate Handle. If fertilizer is loaded,
remove the fertilizer drive chain (unless you are
simultaneously calibrating fertilizer rate).
3.
Clear the FIELD ACRES to 0000.0 on the electronic
acremeter, unless you do not plan to rely on it for
the calibration.
4.
Check that your gauge-wheel tires are
265/70B16.5 NHS Skid Steer and properly inflated.
See “Tire Inflation Chart” in Operator Manual.
5.
Record the weight of one to three empty containers
collectively large enough to hold seed metered for
6% of one acre.
6.
Place several pounds of seed over three seed cups
on the outside end of the left drill box. Pull lower end
seed hoses off of these drops at the opener end.
7.
Turn gauge wheel several times to fill seed cups.
Turn until seed drops to ground from each hose.
8.
Place empty container(s) under the three hoses to
gather metered seed.
9.
Turn gauge wheel until one acre is tallied on
acremeter (130 wheel rotations). While turning,
check that cups have ample seed coming into them.
10. Weigh metered seed. Subtract initial weight of
container(s).
Crushing Hazard:
You may be severely injured or killed by being crushed from a
falling implement or openers. Always have transport locks in
place and frame sufficiently blocked up when working on the
drill.
For example:
using a row spacing of:
7.5in
row count:
63
you desire to plant alfalfa at:
10 pounds per acre;
this corresponds to an initial Seed Rate Handle of:
50
For example:
three 0.5 pound (8 oz.) containers weigh:
1.5 lbs
For example:
the three containers weighed a total 2.2 lbs after test:
0.7 lbs net
NetWeight
GrossWeight
ContainerWeights
–
=
0.7
2.2
1.5
–
=