Great Plains
| 401-647M | 2019-06-11
Table of Contents
Index
72
3PYPA
Table of Contents
Index
Adjustments
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
.
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
235
105
two
260
120
three
295
135
four
355
160
five
415
190
six
475
215
tip
Do Not Use
29831
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
