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Indexing preparation, Basic indexing, Indexing preparation basic indexing – Great Plains YP825AR Material Rate User Manual

Page 20

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16

YP825AR

Table of Contents

Metric Charts

Great Plains Manufacturing, Inc.

401-923B

Table of Contents

Metric Charts

2013-11-11

Indexing Preparation

Tools required:

1.

Find (in page 19-55) 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 11 (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 with tip of tooth stamped “1”

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.

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)

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

Equipment Damage Risk:
Do not apply significant force to meter disk, or drive hub may
be damaged.

Figure 11

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