Great Plains 3PYP Operator Manual - Manual (Page 51)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 47
2014-09-09 Table of Contents Index 401-312M
Setting Seed Rate
The procedure for setting seed rate depends on whether
the planter has ground (contact) drive or hydraulic drive.
Rate setting details are found in other manuals. Some
general information is found in this manual.
Regardless of how rate is set, rate is precisely measured
by the seed monitor, for most seed types.
Indexing
In twin-row operations with finger pickup meters,
seed-to-seed spacing between pairs of a “row” can be
controlled by sprocket indexing (see page 76).
Gauge Wheel Sprocket Selection
On 3PYPs without hydraulic drive, the row units are
driven by the gauge wheels, in ground drive.
Refer to Figure 46
The ground drive assembly has three chains that are
user adjustable:
1. Range
2 of 6 sprockets, stored on shafts
both ends may adjust
2. Transmission
2 of 10 sprockets, stored on vertical spindle
both ends may adjust
3. Upper drive
1 of 2 sprockets, selected by spacer
only one end adjusts
For a specific row-spacing, meter and seed, the starting
sprocket settings for all three chains are found in the
Seed Rate Chart book for this planter (manual part
number 401-312B).
Fine adjustment to planting rate is made by the
Transmission chain
.
Sprocket pairings are identified in the Charts both by
sprocket size and by which sprocket is mounted on which
shaft.
Sprockets are sized by tooth count, stamped on the
sprocket.The same shaft can be both a driving and
driven shaft depending on the required combinations.
The DRIVING shaft on any chain is the one closer to the
gauge wheel (lower in the assembly).
The DRIVEN shaft on any chain is the one further from
the gauge wheel (higher in the assembly).
Seed
Rate
Control
Planter Drive Type
Contact Hydraulic
Coarse
Range Sprockets
(see page 48 and
Seed Rate Manual)
Seed Monitor
Console Data Entry
(see Monitor Manual)
Fine
Upper, Transmission
Drive Sprockets
(see page 49 and
Seed Rate Manual)
Figure 46
Ground Drive Chains
25259
1
2
3
1