Great Plains YP40F Operator Manual - Manual (Page 28)

24 YP2425F/YP4025F Table of Contents Index Great Plains Manufacturing, Inc.
403-362M Table of Contents Index 2013-03-25
Setting Variable Rate Gearbox
The variable rate gearbox allows an infinitely variable
meter drive speed to attain a wide range of application
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 Fertilizer Rate chart shows the
rate for each five degrees of arm rotation.
Refer to the rate chart and set the variable rate gearbox
control arm to its scale setting for the target fertilizer rate
To adjust the Variable Rate Gearbox:
Refer to Figure 10
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 rate chart or as determined by calibration.
3. Reinsert the hairpin cotter.
Note: The variable rate gearbox operates optimally
between 30 and 70. If the target fertilizer rate
appears on both the Low and High Range charts,
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.
Figure 10
Variable Rate Gearbox
31099
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2
3
1
2
2 3