Great Plains YP825A Operator Manual - Manual (Page 71)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 67
2014-08-15 Table of Contents Index 401-651M
Use only enough down pressure to cut the seed trench
and maintain proper soil-firming over seed. With a full
seed load, the force on each row is up to 120 pounds
higher at start of planting.
Excessive row unit spring force will lead to premature
wear on row unit components and uneven seed depth. If
all rows are set to cam 6, some lighter planter
configurations could be lifted out of ground contact.
Refer to Figure 69 (shown at cam setting 2),
Figure 70 and Figure 71
To adjust down pressure, use a 1
1 ⁄
8
inch (29 mm) open
end wrench or the tool stored at the left end of the
planter.
1. Raise the planter. Although this adjustment can be
made with the planter lowered, the springs will be in
tension, and will require more effort. The extra force
required may also damage tools.
2. Install lift cylinder locks.
3. Put tractor in Park and shut it off.
4. Position wrench on the fixed nut near or slightly
forward of vertical.
5. Pull upper spring link back.
6. Move the adjustment cam to the new setting on
the spring adjust bar .
Note: Do not set all rows higher than notch four. Using
high settings across all rows causes uneven
planting. Individual rows may be set higher if
running in tire tracks.
Figure 70
Row Unit Minimum Cam (at 1)
27065
4
6
3
Figure 71
Row Unit Maximum Cam (at 6)
27065
4
5
2
6