Great Plains YP2425A Operator Manual - Manual (Page 73)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 69
2014-02-10 Table of Contents Index 401-626M
An adjuster cam sets 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 30 inch or 70 cm
rows.
Refer to Figure 86
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, uneven seed depth and gauge wheel
slippage.
Refer to Figure 85 (shown at cam setting 2),
Figure 86 and Figure 87
To adjust down pressure, use a 1
1 ⁄
8
inch (29 mm) open
end wrench or the tool stored under the walkboard.
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 85
25AP Series Row Unit
Spring Adjustment
29605
3
5
2
2
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 330 150
two 355 160
three 385 175
four 435 200
five 485 220
six 535 245
tip Do Not Use
34133
Figure 86
Row Unit Minimum Cam (at 1)
27065
bottom
4
6
3
Figure 87
Row Unit Maximum Cam (at 6)
27065
top
4
5
2
6