Great Plains 1007NT Operator Manual - Manual (Page 37)

Great Plains Manufacturing, Inc. Adjustments 33
10/06/2010 150-290M
Calibration Overview
Detailed calibration steps vary with each box. Details are
found in the Seed Rate Manual.
Some general information applies to all boxes.
Calibrate with Drill Raised
Perform the calibration with the drill hitched and raised.
Install cylinder locks.
Calibrate for
1 /
10
th Acre or Hectare
The number of revolutions per area is:
Calibration Crank Storage
Contaminated Sharp Object Hazard:
Exercise care when working with and around the ground drive
wheel. The teeth on the rim may be sharp, and may be coated
with soil and/or agricultural chemicals.
Refer to Figure 22
A calibration crank handle assembly is stored at a
hole
on the upper left side of the main (left) ground
drive weldment. It is secured by a lock nut , and may
require a 3 ⁄
4
in (19 or 20mm) wrench for removal.
For easier access to the ground drive wheel, lock it up
per the instructions on page 23.
Using Calibration Crank
Remove the crank handle from the storage hole on the
weldment. Insert its bolt
in any available hole at the
rim of the ground drive wheel. Tighten the lock nut
loosely, to permit handle rotation.
Use the handle to rotate the wheel counter-clockwise.
A wide range of cranking speeds produce accurate cali-
brations. For reference, at 6 mph (10 kph) field speed,
jackshaft rpm is 57 (about 1 revolution per second).
Crank Handle Parts Reference:
152-584D HANDLE TUBE
802-046C HHCS 1/2-13X5 1/2 GR5
803-169C NUT HEX FLG. LOCK 1/2-13 PLT.
804-017C WASHER FLAT 1/2 USS PLT
Figure 22
Calibration Crank Handle Stored
28470
11
15
23
24
2
1
11
23
15
24
Area Sampled Wheel Revolutions
Full Acre 491.6
49.2
Full Hectare 1214.8
121.5
1/10 th Acre
1/10 th Hectare
1
23
15 2