Great Plains 1007NT Material Rate - Manual (Page 4)

Great Plains Mfg., Inc.
2
150-290B 07/08/2009
Calibration Overview
Detailed calibration steps vary with each box.
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
!
CAUTION
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 1
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.
Access to the ground drive wheel is easier if it is locked
up. See “Ground Drive Lock Up” in the drill Operator
Manual. Be sure to lower drive before planting.
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 1
Calibration Crank Handle
28470
11
12
13
14
2
1
11
13
12
14
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
13
12 2