Great Plains NTA3007 Operator Manual - Manual (Page 92)

88 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
Seed Meter Final Drive Range
Refer to Figure 88 and Figure 89
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 labelled “DRIVING” and “DRIVEN”.
The “DRIVING” shaft is the upper forward shaft.
The “DRIVEN” shaft is the lower rear shaft.
Refer to the seed rate chart (or Fertilizer Rate chart), the
table below, and Figure 88 and Figure 89 for setting the
seed meter final drive range.
1. Remove the pins from the ends of both shafts.
2. Remove and position the gears as shown in the table
above.
3. Secure with pins.
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.
FINAL DRIVE
RANGE
DRIVING DRIVEN
LOW RANGE 17 Tooth Small 54 Tooth Large
HIGH RANGE 54 Tooth Large 17 Tooth Small
Figure 88
Low Final Drive Range
26368
2
1
3
4
DRIVING
DRIVEN
1 2
3 4
Pinch / Crush Hazard:
Install guards before calibrating or operating. Gears are
motion during calibration, even though the implement is
stationary. The figures above depict an earlier version of the
meter, without guards. Do not operate the current meters
without guards.
Figure 89
High Final Drive Range
26369
5
5
DRIVING
DRIVEN
5