Operating instructions

48 YP4-6-825A3P Table of Contents Index Great Plains Manufacturing, Inc.
401-652M Table of Contents Index 2015-01-26
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 rows.
Refer to Figure 43
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 4, some lighter planter
configurations could be lifted out of ground contact.
Refer to Figure 42 (shown at cam setting 2),
Figure 43 and Figure 44
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. On twin-row configurations,
setting all rows to notch 4 or higher results in a net
up force that can exceed the weight of the planter
when the hoppers are nearing empty.
Figure 42
25AP Series Row Unit
Spring Adjustment
31034
3
5
2
2
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 305 140
two 330 150
three 365 165
four 425 195
five 485 220
six 545 250
tip Do Not Use
Values are down force with hoppers empty 29958
Figure 43
Row Unit Minimum Cam (at 1)
27065
bottom
4
6
3
Figure 44
Row Unit Maximum Cam (at 6)
27065
top
4
5
2
6