Great Plains 1625AHL Operator Manual - Manual (Page 76)

72 1625AH Table of Contents Index Great Plains Manufacturing, Inc.
411-020M Table of Contents Index 2014-04-21
Refer to Figure 61
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 adjust tractor tires
so they are not ahead of rows.
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 72 pounds
(33 kg) 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 planter configurations
could be lifted out of correct ground alignment.
Refer to Figure 60 (shown at cam setting 2),
Figure 61 and Figure 62
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 60
25AP Series Row Unit
Spring Adjustment
31034
3
5
2
2
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 255 115
two 265 120
three 285 130
four 315 145
five 345 155
six 375 170
tip Do Not Use
Values are down force with hoppers empty 31947
Figure 61
Row Unit Minimum Cam (at 1)
27065
4
6
3
Figure 62
Row Unit Maximum Cam (at 6)
27065
4
5
2
6