Great Plains YP1625 Operator Manual - Manual (Page 52)

48 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Row-Unit Down Pressure
Row-unit springs provide the down pressure necessary
for row-unit disks to open a seed trench. The springs
allow the row-units to float down into depressions and up
over obstructions. Springs also provide down force on
coulters when using optional row mounted coulters.
You can adjust down pressure individually for each row-
unit. This is useful for penetrating hard soil and planting
in tire tracks. For best results always adjust tractor tires
so they are not ahead of 30in rows.
Use only enough down pressure to cut the seed trench
and maintain proper soil firming over seed. Excessive
row-unit down force will lead to premature wear on row-
unit components. Excessive down force will also cause
uneven seed depth.
Refer to Figure 52 through Figure 54
To adjust down pressure, use 1
1 ⁄
8
in open end wrench or
tool stored under the walkboard. Position wrench on nut
and pull down. Move adjustment cam to new setting. If
using cast tool stored under the walkboard, be sure row
unit is off the ground to fully relax springs.
Minimum and maximum settings are indicated by posi-
tion of adjustment cam. Each notch on adjustment cam
will increase the down pressure on the row-unit springs.
Use the table below as a setting reference.
Spring Down Pressure
Note: Do not set all rows any higher than notch 4. Using
settings above this on all rows will create uneven
depth control and improper function.
Individual rows may be set higher if running in heavy tire
tracks.
Figure 52
Row Unit Cam Operation
21948
Figure 53
Cam Minimum Setting
27065
Cam Notch Pounds
zero (out of notch) Maintenance Only
one 345
two 370
three 400
four 450
five 500
six 550
tip Do Not Use
Figure 54
Cam Maximum Setting
27065