Great Plains EWD13 4109R+ Operator Manual - Manual (Page 21)

4/3/95 5-1
175-083M-A
SEED CALIBRATION
Setting the seeding rate requires four steps: arranging the
drive sprockets, setting the seed-rate adjustment handle,
positioning the seed-cup doors, and checking the seeding
rate.
Refer to the seed-rate charts starting on page 5-3. These
charts list the proper sprocket sizes and seed-rate-handle
settings for various seeds and seeding rates. The seed-
rate charts are based on cleaned, untreated seed of aver-
age size and test weight. The rates are based on 7.5 x 20
rib implement tires. Many factors will affect seeding rates
including foreign material, seed treatment, seed size, field
conditions, tire pressure and test weight. Minor adjust-
ments likely will be needed. Set and check the seeding
rate using the procedures below, then re-adjust the rate
as necessary.
NOTE: Your drill can be equipped with a special pea drive
(Great Plains part number 152-204A). This drive will in-
clude different seed-rate charts.
CHANGING DRIVE SPROCKETS
Refer to the seed-rate charts for the correct drive type–1,
1A, 2 or 2A. Fig. 9 shows the sprocket arrangement for
each drive type.
Drive Types
Fig. 9
To change the drive types:
1. Refer to Fig. 10. Loosen the nut (1) holding the idler
arm (2). Turn arm so chain is slack. Remove chain from
sprockets.
2. Refer to Fig. 11. Rearrange sprocket (1) and plastic
spacers (2) on front shaft so the correct front and rear
sprockets are aligned according to the drive type.
a. Pull spacers off shaft.
b. Slide sprockets as necessary and place plastic di-
viders back on shaft between sprockets as neces-
sary.
3. Slide idlers on idler arms so they are aligned with cor-
rect sprockets. Reinstall chain.
4. Turn idler arm as indicated by drive type to remove
slack from chain. Retighten nut that holds idler arm.
Loosen Idler Spacer
Fig. 10
Rearrange Sprockets on Front Shaft
Fig. 11
Drive-Type Ratios
Type 2 is Slowest
Type 2A is Two Times Faster Than Type 2
Type 1 is Three Times Faster Than Type 2
Type 1A is Five Times Faster Than Type 2
Type 2 Type 2A
Type 1 Type 1A
16472
16473
1
2
16475
1
2