Great Plains
| 166-207M | 02/26/2019
76
NTA907HD and NTA3007HD
Adjustments
Setting Variable Rate Gearbox
The variable rate gearbox lets you infinitely vary meter
drive speed to attain a wide range of seeding rates. The
ratio of gearbox input speed to output speed is controlled
by the position of a gearbox control arm. The control arm
has an indicator that points to a scale marked in degrees.
The Seed Rate and Fertilizer Rate charts show the rate
for each degree of the control arm rotation.
Refer to the seed rate charts and set each variable rate
gearbox control arm to its scale setting for the desired
seeding rate.
To adjust the Variable Rate Gearbox for each hopper:
1.
Remove the hairpin cotter securing the gearbox
adjustment crank.
2.
Rotate crank until the control arm indicator points to
the scale setting that matches the rate from the Seed
Rate chart or determined by calibration.
3.
Reinsert the hairpin cotter.
The variable rate gearbox operates optimally
between 30 and 70. If a seed has charts for both
HIGH Range and LOW Range, the most consistent
results are obtained when the gearbox control arm is
set between 30 and 70. Settings below 20 degrees
are not recommended. When the control arm is set
above 70 degrees, large movements of the arm result
in small changes in seeding rate.
If you will be metering the same material from both
bins at the same time, use the Seed Rate chart entry
for
half
the desired application rate. Do not use a half
scale setting - the effect of the variable rate gearbox
control arm is not linear.
Figure 80
Variable Rate Gearboxes
26306
6
7
8
Содержание NTA3007HD
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