Great Plains 3P600 Material Rate - Manual (Page 8)

6 3P500, 3P500V & 3P600 Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
118-794B Table of Contents Main Box Rates 2011-10-21
7. If not already done, set the Drive Type, Seed Rate
Handle and Seed Cup Doors across the drill. If any
optional seed boxes are loaded, disconnect their
drive or set their rate to zero (unless you are
simultaneously calibrating multiple boxes).
8. Load seed above the rows to be sampled. Load well
more than the expected sample size.
9. Rotate the crank several turns to ensure that the
drives and seed cups are engaged, working properly,
free from foreign material, and that seed is flowing
steadily from the meters. Stop.
10. Note the current reading of the acremeter, unless
removed or you do not plan to rely on it for the
calibration.
11. Empty the sample containers back into the seed box,
and place them back under the three hoses to gather
metered seed.
12. Turn crank at a steady rate until one tenth acre or
hectare is tallied on acremeter (or count rotations
based on the table on page 5). While turning, check
that cups have ample seed coming into them.
13. Weigh metered seed. Subtract initial weight of
container(s).
14. Divide the net seed weight by three. Multiply by
number of openers on your drill, and then by ten, to
determine the total of pounds per acre seeded.
15. The Seed Rate Handle scale is a percentage of
meter opening, and its effect is linear near scale
center. Calculate a new scale setting based on the
test.
Set the Seed Rate Handle to the new scale setting.
16. You may want to repeat calibration procedure at the
new setting if your results varied greatly from the
Seed Rate Chart, or if you must operate near the
ends of the Seed Rate handle scale (0-20 or
90-100).
17. With calibration complete, store calibration crank,
re-engage hub if locked-out, reinstall any removed
chains or sprockets, reconnect seed hoses and re-
install acremeter (if removed - tighten only to snug).
18. Check that your tire(s) is(are) properly inflated. See
“Tire Inflation Chart” in Operator manual.
When drilling, check seeding rate by noting acres drilled,
amount of seed added to drill and seed level in drill box.
If you are seeding more or less than desired, adjust rate
slightly to compensate for field conditions.
Example: you desire to plant barley at:
60 pounds per acre
which is between
45 and 50
on the Drive Type 2 chart.
Use an initial Seed Rate Handle (InitialHandle) scale
setting of:
48
3P600 crank rotations for one tenth acre:
78.6
Example: the containers weighed a total of 3.23
pounds after test:
1.73 lbs net
1.73 3.23 1.5 – =
NetWeight GrossWeight ContainerWeight – =
Example: MeasuredRate is:
52 lbs/ac
52
1.73
3
----------- 9 10 Ч Ч =
MeasuredRate
NetWeight
3
--------------------------- OpenerCount Ч
10
Ч
=
Example:
the target rate was 60 lbs/ac, and the initial scale 48:
the new scale setting is:
55
55
60
52
------ 48 × = NewScale
TargetRate
MeasuredRate
--------------------------------------- PreviousScale Ч =