Great Plains YP2425A Material Rate - Manual (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Metric Charts Sprocket Indexing (Stagger) 23
2012-02-29 Table of Contents Metric Charts 401-626B
Indexing Preparation
Tools required:
1. Find (in page 26-27) 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.
Basic Indexing
Refer to Figure 6 (which depicts tooth 1 slightly ahead of the
index rib at 2:00)
4.
Use drive shaft to set front row unit to index 1.
Observe the meter drive sprocket at a front (short
mount) row unit on each wing. Use the wrench, from
the rear of the shaft, to rotate the shaft forward
(wrench up and forward).
Stop rotation when the tip of the tooth stamped “1”
is aligned with a rib
cast into the meter housing. In
general, the 2:00 rib is the easiest to use, as it is
visible from the side and from behind the meter.
5. Check front sprocket synchronization.
Inspect all meter drive sprockets on front row units.
Check that all springs are taut, and no chains have
slack. All sprockets should be at “1”. If not, use
step 6 through step 10 to set them to 1. Although
front sprockets machine-wide may be at 1 after this
check, sprockets do not remain in sync wing-to-wing,
due to clutch operation.
With Swath Command™, front sprockets are not
synchronized planter-wide. With row clutches, each
front sprocket must be checked when timing the
mating rear sprocket of the row pair. The front row
can be advanced by manually turning the tandem
sprocket forward until the front sprocket is at 1. Then
set the rear sprocket. Check that the front sprocket
has not moved.
•
7 ⁄
8
inch (23 mm) open end wrench
•
3 ⁄
8
inch socket wrench, or
any socket wrench with
3 ⁄
8
in. (9.5 mm) square
drive
• 812-391C timing tool (located under walkboard)
Note: The 812-391C tool was introduced in late 2010.
Check latest Parts manual for storage mount
hardware part numbers.
Note: Sprocket indexing is possible 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.
°
Figure 5
812-391C Timing Tool
31445
Equipment Damage Risk:
Do not apply significant force to meter disk, or drive hub may
be damaged.
Figure 6
Sprocket Indexing Reference
29630
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2
Note: Without Swath Command™: In the future, finding
front sprockets out of sync on a wing suggests idler/
spring problems, and/or worn chain. Row drive
systems must be in reliable working order for
effective sprocket indexing.
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2