Fertilizer application option – Great Plains PH-20 Operator Manual User Manual
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Section 3 Adjustments
12/29/2011
PH-15, PH-20, PFH-15 and PFH-20 Precision Fertilizer Hitch 148-365M
Great Plains Mfg., Inc.
Fertilizer Application Option
The fertilizer-application system uses a piston pump. The
pump is ground driven. The pump moves fertilizer into a
plumbing manifold mounted along the coulter toolbar.
An orifice is installed under the quick cap on each manifold
outlet. The orifice creates a small amount of back pressure
in the manifold and prevents the outlets nearest the pump
from getting too much of the total flow.
Remember, application rates are determined by pump
setting and size of pump driver sprocket. Orifice size does
not affect the application rate.
The following instructions and rate chart apply to the John
Blue model LM-2455 piston pump sold as an option with
the PFH-15 and PFH-20.
Adjusting Fertilizer Application Rate
1.
Refer to rate chart. Find your desired application rate
and note sprocket range (high or low) and pump set-
ting required for your desired application rate.
2.
Set sprocket range. Check the number of teeth on the
driver sprocket. See Figure 3-9.
• For low range, use the 23-tooth sprocket
• For high range, use the 47-tooth sprocket
Figure 3-9
Pump Driver Sprocket
To change sprockets, loosen the twin idler sprockets
and remove chain. Pull quick pins off end of shaft and
end of sprocket-storage post. Swap the sprockets and
reinstall quick pins and chain. Route the chain as
shown in Figure 3-9.
18044
3.
Set pump. Loosen scale-setting nut (1) on side of
pump-calibration dial. Use special wrench (2) from
John Blue to rotate notched disk until pointer is at de-
sired setting. Tighten scale-setting nut, being careful
not to over tighten nut. See Figure 3-10.
NOTE: The adjustment wrench can be stored in a slot (3)
provided in the pump mount bracket.
Figure 3-10
Setting Pump
Fertilizer Application Rates
Application Rates, Gallons per Acre
Pump
Setting
15-Foot Hitches
20-Foot Hitches
Low Range
(23 Tooth)
High Range
(47 Tooth)
Low Range
(23 Tooth)
High Range
(47 Tooth)
10
5
10
4
8
15
8
16
6
12
20
10
21
8
16
25
13
26
10
20
30
15
31
12
24
35
18
37
13
28
40
21
42
15
31
45
23
47
17
35
50
26
52
19
39
55
28
58
21
43
60
31
63
23
47
65
33
68
25
51
70
36
73
27
55
75
38
79
29
59
80
41
84
31
63
85
44
89
33
67
90
46
94
35
71
95
49
100
37
75
100
51
105
38
79
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