Setting fertilizer transmission, Setting the fertilizer adjuster – Great Plains V-300F Operator Manual User Manual
Page 90
86
V300 & V300F
Great Plains Manufacturing, Inc.
148-057M-A
11/15/2007
Setting Fertilizer Transmission
Refer to Figure 92
The fertilizer transmission is a variable pair of sprockets
(the DRIVING sprocket
DRIVEN sprocket
on the output shaft).
The available sprockets provide an 8:1 span of rates
within each Range sprocket setting, and a rate increment
of about 4% per step. This usually provides enough con-
trol to achieve target application rates without using the
adjuster.
The sprocket pair to use is initially determined by the fer-
tilizer rate chart (with any density correction applied),
and then by calibration.
To change the transmission setting:
1.
Loosen the chain idler. Lift the chain off both sprock-
ets and move it to machine left, resting on the shafts.
2.
Un-pin the shaft ends and remove all sprockets. The
sprocket sizes (tooth counts) are stamped on the
face of each sprocket.
3.
Install the specified Driving and Driven pair.
4.
Return unused sprockets to the shafts and re-pin.
5.
If fertilizer rate calibration is planned, and/or the
planting is from the small seeds box, disengage the
main seed box clutch
6.
Replace guard
Setting the Fertilizer Adjuster
Refer to Figure 93
The fertilizer box has an adjuster, located near box cen-
ter. On the V300 and V300F drills, it is normally left at
100, but can be used to fine tune a rate where the near-
est Range and Driver/Driven combinations are not close
enough to the desired rate.
Note: Always calibrate when using the adjuster. Avoid us-
ing adjuster settings below 35. Pick a higher
sprocket rate, and adjust down from that.
To adjust, rotate the adjuster knob
located to the right
of the scale
. Rotate clockwise to reduce rate. The
knob stays at your setting due to springs clamping a nut
at the left end of the shaft.
The effect of the adjuster is not linear. The following table
shows the approximate effect of various settings.
Figure 92
Fertilizer Drive: Range
27255
DRIVING
DRIVEN
5
6
7
7
Figure 93
Fertilizer Rate Adjuster
26299
8
9
Fertilizer Rate Handle Scale Setting
Chart: f1a
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Reduced Fertilizer Rate (percent)
0%
0%
3%
4%
8%
16% 22% 29% 36% 43% 50% 56% 64% 71% 76% 85% 91% 95% 98% 99% 100%