GREAT PLAINS YP-425, Operator'S Manual

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YP-425, 625, 825, & 1025-A3P Table of Contents Index Adjustments 55
2018-07-23 Table of Contents Index 401-652M
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 50
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 49 (shown at cam setting 2),
Figure 50 and Figure 51
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 .

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 48
25AP Series Row Unit
Spring Adjustment
31034
3
5
2
2
Cam Notch Pound s Kilo g ram s
zero (o u t of notch) Lock-Up & M a inten a nce
one 3 05 140
two 33 0 150
three 3 65 165
fo u r 425 195
five 4 8 5 220
s ix 545 250
tip Do Not U s e
V a l u e s a re down force with hopper s empty 2995 8
Figure 49
Row Unit Minimum Cam (at 1)
27065
bottom
4
6
3
Figure 50
Row Unit Maximum Cam (at 6)
27065
top
4
5
2
6