Great Plains YP825AR Operator Manual User Manual
Page 71
Great Plains Manufacturing, Inc.
Adjustments
67
2014-06-17
401-923M
Refer to Figure 73
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.
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 72 (shown at cam setting 2),
Figure 73 and Figure 74
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 72
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 73
Row Unit Minimum Cam (at 1)
27065
4
6
3
Figure 74
Row Unit Maximum Cam (at 6)
27065
4
5
2
6