Great Plains 3N-4025P Operator Manual - Manual (Page 105)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 101
2014-01-29 Table of Contents Index 196-538M
Unit-Mounted Coulter Adjustments
Unit-mounted coulters (UMC) are an optional alternative
to frame-mounted coulters. Only one type of coulter may
be installed. See page 165 for ordering information.
Note: Unit-Mount Coulters are not factory-installed.
Check alignment and depth prior to first use.
10HD Coulter Depth Adjustment
Check frame height before making any UMC
adjustments. See “Frame Height without
Frame-Mounted Coulters” on page 72.
The ideal operating depth for unit-mounted coulters is
1 ⁄
4
inch (6.4 mm) above opener depth. Although they
may have originally been set to this depth, coulter (and
opener) blades wear with time, and may need adjusting.
Adjusting the coulter depth is accomplished by
re-mounting the coulter blade in one of the six mounting
holes arranged in a staggered pattern in the coulter
bracket.
Refer to Figure 135 and Figure 136
Raise drill and install cylinder locks before working on
coulters. Row unit may be fully lowered or locked up. Do
not attempt to move blade when the current or new
position causes it to contact the ground during the
adjustment. Be careful around the front end of row units.
Coulter blades may be sharp.
To adjust coulter depth:
1. Determine the present opener and coulter depths.
2. Note which bracket hole the coulter is presently
using.
3. Determine which new hole will position the coulter
closer to the
1 ⁄
4
inch-above depth. See the table
below.
4. Remove the
5 ⁄
8
-11 x 4 inch bolt, lock washer and nut
( in Figure 135).
5. Move the blade to the new position. Insert the bolt,
and tighten on the lock washer and nut.
If a worn coulter cannot be adjusted to satisfactory
operating depth, replace the coulter blade.
Hole
No.
Depth of (new) coulter blade relative
to (new) opener blades
1 inch above
5 ⁄
8
inch above
1 ⁄
4
inch above
0 (factory standard hole)
3 ⁄
8
inch below
3 ⁄
4
inch below
Figure 135: 10HD Series:
10HD Series Unit-Mounted Coulter
22817
7
Figure 136: 10HD Series:
Coulter Blade Mounting Holes
23288
1
2
5
4
3
6
7
2
3
5
1
4
6