Great Plains CP1000 Operator Manual - Manual (Page 31)

29
Section 3 Adjustments
7/5/2005 CP1000 Three-Meter Drill and Hitch 148-358M
Great Plains Mfg., Inc.
Fertilizer Rate Calibration
The fertilizer option has chain drives powered off the
gauge wheels to meter fertilizer. Adjust the application
rate by changing drive sprockets.
Fertilizer application rates will vary with fertilizer type, den-
sity and particle size. Relative humidity and field condi-
tions can also affect application rates. The charts on page
30 are based on fertilizer with average particle size and a
density of 1.04 kilograms per litre (65 pounds per cubic
foot). Initially set rate according to charts, then calibrate
drill to your material as described on this page.
1. Refer to fertilizer rate charts on page 30 for correct
sprocket sizes for your drill and desired meter rate.
2. To switch between high and low range, loosen and
slide idler sprocket (1) out of chain shown in Figure 3-
16. Remove lynch pin from end of shaft and install cor-
rect sprocket.
•
For high range, install 16-tooth sprocket and shorten
chain by removing 16-pitch strand.
•
For low range, install 44-tooth sprocket and lengthen
chain by reinstalling 16-pitch strand.
•
For extra-high range, install 12-tooth sprocket and
shorten chain by removing 16-pitch strand.
Move idler sprocket back into place so chain has 6 mm
(1/4-inch) slack.
Figure 3-16
Hi/Low Range Sprocket
3. To change driver/driven ratio, refer to Figure 3-17.
Loosen and slide idler sprockets out of chain. Remove
lynch pins from shafts. Place correct sprockets on
shafts. Store sprockets not used on ends of shafts.
Reinstall chain and slide idlers back into place so
chain has 6 mm (1/4-inch) slack.
IMPORTANT: The rate charts are for granular fertilizer
with a density of 1.04 kilograms per litre (65 pounds
per cubic foot). If you are applying fertilizer with a dif-
ferent density, use density conversion chart on page
30.
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16T/44T
1
Figure 3-17
Driver/Driven Sprockets
4. Raise drill with tractor hydraulics so the contact
wheels are not touching the gauge wheels. Rotate
drive gauge wheel to see that metering system is
working properly and free from foreign material.
5. Check that your gauge-wheel tires are 13.0/55-16 12
PR AW and properly inflated. Refer to Tire Inflation
Chart, “Appendix,” page 42.
6. Place several kilos (pounds) of fertilizer over three fer-
tilizer feed cups on outside end of drill box. Pull ferti-
lizer tubes off of these three disk openers.
7. Weigh an empty container large enough to hold ferti-
lizer applied to one hectare (acre).
8. Turn drive wheel until fertilizer starts to drop to ground.
9. Place container under the three tubes to gather me-
tered fertilizer.
10. Turn drive gauge wheel 319 rotations for a one-hectare
seeding rate or 127 rotations for a one-acre seeding
rate. Check that feed cups have plenty of fertilizer com-
ing into them.
11. Weigh metered material. Subtract weight of empty
container. Divide by three. Multiply by number of
openers on your drill to determine total kilograms
(pounds) metered per hectare (acre). If this figure is
different than desired, reset sprockets accordingly.
NOTE: You may want to repeat calibration procedure if
your results vary greatly from fertilizer rate chart.
12. When drilling, check metering rate by noting hectares
(acres) drilled, amount of fertilizer added to drill and
level of material in drill box. If you are applying more or
less fertilizer than desired, adjust metering rate slight-
ly to compensate for field conditions.
Dr
iven
Dr
iver
16378