Great Plains NTA2007 Operator Manual - Manual (Page 80)

76 NTA607 or NTA2007 Table of Contents Index Great Plains Manufacturing, Inc.
166-372M Table of Contents Index 2012-01-05
Seed Meter Final Drive Range
Refer to Figure 59 (which depicts the range gears with guard
removed - do not operate without guards)
The meter flute shaft
is driven by the agitator shaft
through a pair of interchangeable gears , . The
positioning of these gears creates two final drive ranges.
Each Seed Rate Chart is based on a specific Final Drive
Range. The Ranges are:
• “High” range, which is used for larger seeds and
higher seeding rates
• “Low” range, which is used for smaller seeds and
lower seeding rates
The meter shafts are DRIVING” and “DRIVEN”.
The “DRIVING” shaft is the upper (agitator) shaft.
The “DRIVEN” shaft is the lower (flute) shaft.
Refer to the Seed Rate Chart (or Fertilizer Rate chart),
the table at right, and Figure 59 for setting the seed
meter final drive range.
1. Remove the nut and bolt ( , not visible) securing the
application rate sensor to the restraining straps at
the meter sensor mount.
2. Loosen the thumbscrew .
3. Remove the pins from both shafts. Move the rpm
sensor clear of the flute shaft.
4. Remove and position the gears as shown in the table
at right.
5. Secure the DRIVING gear on the agitator shaft with
a pin.
6. Secure the DRIVEN gear with the rpm sensor and a
pin.
7. Use the thumbscrew to eliminate any rotational play
in the sensor-to-shaft coupling.
8. Using the nut and bolt, secure the rpm sensor to the
restraining straps at the meter sensor mount.
Disable a Seed Meter
To avoid operating a meter:
1. Remove a final range gear and leave it off.
2. Set the variable rate gearbox to zero.
These steps are recommended even when the unused
hopper is empty, to:
• reduce gearbox and meter wear
• during calibration, to avoid clogging air tubes at the
meter not under test, and;
• avoid metering undesired material in the field.
Figure 59
High Final Drive Range
26368
FINAL DRIVE
RANGE
DRIVING DRIVEN
LOW RANGE 17 Tooth Small 54 Tooth Large
HIGH RANGE 54 Tooth Large 17 Tooth Small
2
1
3
4 DRIVING
DRIVEN
7
8
5
6
8
1 2
3 4
5
6
7
8