Great Plains 3N-4025P Operator Manual - Manual (Page 89)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 85
2014-01-29 Table of Contents Index 196-538M
Finger Meter Sprocket Indexing (Stagger)
This topic applies only to finger meters.
If you are planting:
• finger-metered,
• twin-row crops,
• at seed interval spacings above 6
1 ⁄
2
inches (16.5 cm),
you can synchronize each pair of adjacent meters in a
twin row so that you achieve the maximum seed-to-seed
spacing between the units of the pair.
If you are planting:
- single-row,
- or with singulating meters,
- or a volumetric crop,
- or twin row with seed spacings below 6
1 ⁄
2
in (16.5 cm),
this section of the manual, and the sprocket indexing
charts, do not apply to your operations.
If the initial indexing does not provide equal spacing, see
“Indexing Fine Adjustment” on page 87.
Refer to Figure 109
1. Find the chart for your row spacing, meter finger
count and desired seed population. Note the
“Tooth Number” value for the “Rear Meter” in the far
right column.
2. Remove both meters of a row unit pair. Note that
tooth 1 and many of the other teeth on the driven
sprockets
, are stamped with a tooth number.
On front row unit:
3. Relax idlers on front meter drive by lifting the
spring off the rear post .
4. Lift chain off driven sprocket , and rotate sprocket
so that tooth 1 is as close as possible to straight up
(TDC: top dead center, 12:00 position).
5. Re-engage chain and idlers, making sure chain is
taut at top, and that sprocket tooth 1 has not shifted
off TDC.
On rear row unit:
6. Relax idlers on rear meter drive by lifting the
spring off the rear post .
7. Lift chain off driven sprocket , and rotate sprocket
so that the tooth number called for in the chart is at
TDC (or is the same as the front row sprocket).
8. Re-engage chain and idlers, making sure chain is
taut at top, and that the designated sprocket tooth
has not shifted off TDC.
9. Re-install meters. No particular wheel orientation is
required during meter installation. The meter
engagement is symmetrical, and the results identical
no matter how the coupler captures the meter shaft.
28420
Figure 109
Sprocket Indexing
25417
1 2 3
5
4
6
1 2
3
4
1
5
6
2