Great Plains 3N-4025P Operator Manual - Manual (Page 123)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 119
2014-01-29 Table of Contents Index 196-538M
25 Series Opener Depth
Refer to Figure 172
The “T” handle
sets planting depth by limiting the how
high the side depth gauge wheels ride relative to the
opener disks. The position of the seed tube itself is fixed
relative to the disks, and is not adjusted.
With the drill raised, lift both side depth wheels against
the stop and measure the depth of exposed opener disk
below it. Do not lift just one wheel, as the 25 Series T
handle sets the average depth of both wheels.
Alternatively, check the actual furrow depth with openers
lowered and pulled forward in field conditions.
To adjust seed depth, pull the “T” handle up and back,
move it forward or aft, and set it back in a different pair of
holes in the scale.
• For shallower planting, move the “T” handle forward.
• For deeper planting, move the “T” handle back.
Check opener down-pressure and press wheel(s) after
adjusting depth. See “25 Series Row Unit
Down-Pressure” on page 116, and “25 Series Press
Wheel Adjustments” on page 122.
25 Series Disk Blade Adjustments
Note: Applies to all Series openers.
Opener Disc Contact Region
Refer to Figure 153
Opener disc angle and stagger is not adjustable, but
disc-to-disc spacing is, and may need attention as discs
experience normal wear. Spacers will need to be reset
when blades are replaced.
The ideal spacing causes the blades to be in contact for
about one inch
. If you insert two pieces of paper
between the blades, they should slide to within zero
(touching) to 1.5 in. (3.8 cm) of each other. If zero, the
gap between the blades should not be significantly
greater than the thickness of two sheets of paper.
If the contact region is significantly larger or there is a
large gap, it needs to be adjusted by moving one or more
spacer washers.
1
Figure 172: 25 Series:
Opener Depth
29330
{
Inspect Furrow Here
1
Figure 173
Opener Disc Contact Region
26127
1
2
1