Great Plains NTA2000D Operator Manual - Manual (Page 39)

37 9/13/2006 NTA 2000D 148-632M
Great Plains Mfg., Inc.
11. If the result is different to the required rate, adjust the
Variator to increase or decrease the seeding rate. Re-
member to re-prime the feed mechanism with at least
50 turns before re-calibrating.
Note: Always move the Variator handle down to zero then
back up to the required setting.
Calibrations for Number of Turns
As indicated at the start of this section, accuracy in calibra-
tion can be affected by a number of factors not least of
which is soil type, wheel slip and sinkage. The number of
turns recommended for the calibration crank handle are
based on “average” figures in normal field conditions. If
farm conditions are very stony (so little sinkage) or very
sandy (so greater sinkage) then using the recommended
number of crank handle turns may be inaccurate.
To check the number of turns for individual field
conditions:
Refer to Figure 53
1. Shut down the shut-off slide above each roller to pre-
vent seeding.
2. Fill the drill half to two-thirds full of seed.
3. Mark out 218 feet of seedbed.
4. Position the calibration handle on the Variator input
and rotate to the upright (12 o’clock) position to give a
clear starting point.
5. Drive the distance marked-off in the seedbed and
count the number of turns the calibration handle
makes.
6. Note the number of turns and use this figure in the
Checking the Seeding Rate procedure in the previous
section in place of the standard.
Hopper Clean-out
Refer to Figure 54
The seed hopper has two slide gates connected to dis-
charge hoses for cleaning out the bulk of the seed from the
hopper. Each slide gate is controlled by a handle that
extends out beyond the end of the meter assembly. The
discharge hose can be directed into a bag or into the
auger hopper.
Final meter clean-cut must be done using the calibration
trays. Slide the venturi units forward and place the calibra-
tion trays under the feed rolls. Move the flap adjustment
handle to the full open position and empty the remaining
seed into the trays. The flap handle can be closed when
the trays are emptied.
Refer to Figure 55
The air distribution chamber must be inspected and keep
clean daily.
1. Remove end caps and visually inspect chamber.
2. To clean chamber, remove end caps and blow out
chamber with the fan.
Make sure the area around the openings is clear and that
no one will enter the area before starting fan.
Figure 54
Clean-out Handle
19938
Figure 55
Air Box End Cap
19936
Figure 53
Individual Shut Off
19934