Great Plains YP825A3P Operator Manual User Manual
Great Plains Manufacturing, Inc.
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
inch (29 mm) open
end wrench or the tool
stored at the left end of the
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.
Install lift cylinder locks.
Put tractor in Park and shut it off.
Position wrench on the fixed nut
near or slightly
forward of vertical.
Pull upper spring link
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.
25AP Series Row Unit
zero (out of notch)
Lock-Up & Maintenance
Do Not Use
Values are down force with hoppers empty
Row Unit Minimum Cam (at 1)
Row Unit Maximum Cam (at 6)