Great Plains YP3025A Operator Manual - Manual (Page 71)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 67
02/16/2012 Table of Contents Index 401-705M
An adjuster cam sets down force individually for each
row unit. With the optional Row-Pro™ system, the cam
sets maximum down force.
Refer to Figure 70
Higher settings are useful for penetrating hard soil.
Isolated higher settings are useful for planting in tire
tracks. For best results always adjust tractor tires so they
are not ahead of 30in or 70cm rows.
Use only enough down pressure to open the furrow and
maintain proper soil-firming over seed. Excessive down
force leads to premature wear on row unit components,
uneven seed depth and gauge wheel slippage.
Refer to Figure 69 (shown at cam setting 2),
Figure 70 and Figure 71
To adjust down pressure, use a 1
1 ⁄
8
in (29mm) 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, causing more effort, and the optional
Row-Pro™ system might be active, and fighting you.
The extra force required might 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 plant-
ing. Individual rows may be set higher if running in
tire tracks.
Null4:
Null4:
Null4:
Null4:
Null4:
Null4:
Null4:
Note: With the optional Row-Pro™ system, do not use
higher cam settings for rows in tire tracks unless
there is actual need. If these rows do not need the
extra force, the cam setting could imbalance the
Row-Pro™ system.
Figure 69
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
4
6
Null4:
Figure 70
Row Unit Minimum Cam (at 1)
27065
3
Null4:
Figure 71
Row Unit Maximum Cam (at 6)
27065
4
5
2
6