Great Plains YP625PD Material Rate - Manual (Page 27)

Great Plains Manufacturing, Inc. Table of Contents Sprocket Indexing (Stagger) 25
09/29/2011 Table of Contents 401-754B
Indexing Preparation
Tools required:
1. Find (in page 28-29) 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 frees
the ground drive wheel, allowing you to turn the
wheel, or turn the drive shaft with a hand tool.
Crushing Hazard:
Install transport locks. Do not rely on hydraulics to hold the
planter at raised. This adjustment takes some time.
3. Clean out meters. Leave seed discs out.
See Operator Manual for procedure.
Refer to Figure 11 (which depicts tooth 1 slightly ahead of the
index rib at 2:00)
4.
Use drive shaft or ground drive wheel 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 ground drive
wheel, or a 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 rib at the 2:00 position 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.
Equipment Damage Risk:
Do not apply significant force to meter disk, or drive hub may
be damaged.
• 23mm (
7 ⁄
8
in) open end wrench
• 10mm (
3 ⁄
8
in) socket wrench, or
any socket wrench with 9.5mm square drive
• 812-391C timing tool (located on a hopper mount)
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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.
Figure 10
812-391C Timing Tool
31445
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Note: In the future, finding front sprockets out of sync
suggests idler/spring problems, and/or worn chain.
Row drive systems must be in reliable working
order for effective sprocket indexing.
Figure 11
Sprocket Indexing Reference
29630
1
2
1
2