Material Rate User Manual

Great Plains Manufacturing, Inc. Table of Contents Sprocket Indexing (Stagger) 67
2014-03-17 Table of Contents 411-020B
Indexing Preparation
Tools required:
1. Find (in page 73-page 75) 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 13 (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 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. 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.
When equipped with swath control clutches the front
sprockets will not be synchronized. When swath
control clutches are in place each front sprocket
must be checked when timing its mating rear
sprocket. 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.
• 23 mm (
7
⁄
8
inch) open end wrench
• 9.5 mm (
3
⁄
8
inch) socket wrench, or
any socket wrench with
3
⁄
8
in square drive
• 812-391C timing tool (located at left lights)
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 12
812-391C Timing Tool
31445
Equipment Damage Risk:
Do not apply significant force to meter disk, or drive hub may
be damaged.
Figure 13
Sprocket Indexing Reference
29630
1
2
Note: 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.
1
2