Great-plains YP2425A Material Rate User Manual download pdf (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.

•

⁄

inch (23 mm) open end wrench

•

⁄

inch socket wrench, or

any socket wrench with

⁄

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

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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