Great Plains 2525P Operator Manual - Manual (Page 35)

Great Plains Manufacturing, Inc. Adjustments 31
2013-05-10 118-231M
Adjusting 25-Series Down-Force
Refer to Figure 28
An adjuster cam
sets row unit spring down pres-
sure individually for each row unit. This is useful for pen-
etrating hard soil and planting in tire tracks. For best
results always adjust tractor tires so they are not ahead
of twin rows.
Refer to Figure 30
Use only enough down pressure to cut the seed trench
and maintain proper soil-firming over seed. Excessive
row unit down force will lead to premature wear on row
unit components, uneven seed depth and gauge wheel
slippage.
Refer to Figure 29 (shown at cam setting 2)
To adjust down pressure, use a 1
1 ⁄
8
in open end wrench
or the tool stored under the walkboard.
1. Raise the drill. Although this adjustment can be
made with the drill lowered, the springs will be in
tension, and will require more effort. The extra force
required may also damage tools.
2. Put tractor in Park and shut it off.
3. Position wrench on the fixed nut near or slightly
forward of vertical.
4. Pull upper spring link back.
5. 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 plant-
ing. Individual rows may be set higher if running in
tire tracks.
Cam Notch Pounds
zero (out of notch) Use Only for Lock-Up
one 345
two 370
three 400
four 450
five 500
six 550
tip Do Not Use
Figure 28
25 Series Row Unit Springs
25118
2
1
2 1
Figure 29
25 Series Row Unit
Spring Adjustment
25268
2
3
5
4
6
3
4
Figure 30
Row Unit Minimum & Maximum
21966
21967
5
2
6