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YP1225A and YP1625A Table of Contents Index Sprocket Indexing (Stagger)
Great Plains | 401-625B | 6/19/19 13
Sprocket Indexing (Stagger)
If you are planting:
•
with a seed disc having 24 cells or less,
• twin-row crops,
• at seed populations below 45,000 seeds/acre
(111 000 seeds/ha),
you can synchronize each pair of adjacent meters in a
twin row for maximum seed-to-seed spacing between
the units of the pair.
If the initial indexing does not provide equal spacing, see
“ Fine Adjustment Indexing ” on page 15.
 NOTE:
Due to limitations on the number of sprocket teeth and
wheel cell count, it may not be possible to obtain perfect
stagger. Charts and fine adjustment provide the optimal
available stagger.
If you are planting:
•
single-row,
• or with seed discs or 25 cells or more,
• or a volumetric crop,
this section of the manual, and the sprocket indexing
charts, do not apply to your operations.
 Basic Indexing
Tools required:
•
7
/
8
inch (23 mm) open end wrench
•
3
/
8
inch socket wrench, or any socket wrench with
3
/
8
inch (9.5 mm) square drive
• 812-391C timing tool (located under walkboard)
Crushing Hazard:
This adjustment takes some time. Install transport locks. Do
not depend on hydraulics to hold the planter in the raised
position.
1. Find (on pages 16 to 18) the sprocket indexing chart
for your row spacing, cell count and desired seed
population.
Note the “
Initial Rear Tooth Number ” value in the
second column.
2. Raise the planter.
Chain geometry changes slightly when lowered. The
indexing charts account for this change, and assume
the planter is raised. Also, raising the planter
disengages the drive clutches, allowing you to turn
the drive shaft with a hand tool.
3. Clean out meters. Leave seed discs out. See
Operator Manual for procedure.
 NOTE:
Sprocket indexing may be performed with seed present
and discs installed, but if so, you must perform step 9
(chain taut check) by rotating the drive shaft forward to
remove slack. Reverse meter rotation, with seed present,
is not recommended.
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