Great Plains 3PYPA Operator Manual - Manual (Page 75)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 71
03/20/2012 Table of Contents Index 401-647M
Coulter Adjustments
Note: Coulters are not factory-installed. Check alignment
and depth prior to first use.
Coulter Depth Adjustment
The ideal operating depth for coulters is
1 ⁄
4
in (6mm)
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-mount-
ing the coulter blade in one of the six mounting holes
arranged in a staggered pattern in the coulter bracket.
Refer to Figure 86 and Figure 87
Raise planter 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 posi-
tion causes it to contact the ground during the adjust-
ment. Be careful around the front end of row units. Row
cleaner tines and 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
in-above depth. See the table below.
4. Remove the
5 ⁄
8
-11 x 4in bolt, lock washer and nut (
in Figure 86).
5. Move the blade to the new position. Insert the bolt,
and tighten on the lock washer and nut.
6. Re-adjust row cleaners, if installed.
If a worn coulter cannot be adjusted to satisfactory oper-
ating depth, replace coulter.
Hole
Number
Depth of (new) coulter blade
relative to (new) opener blades
1in (25mm) above
5 ⁄
8
in (16mm) above
1 ⁄
4
in (6mm) above
0
3 ⁄
8
in (9.5mm) below
3 ⁄
4
in (19mm) below
Null4.aac:
Figure 86
25 Series Unit-Mounted Coulter
29124
7
Null4:
Figure 87
Coulter Blade Mounting Holes
29125
1
2
5
4
3
6
7
2
3
5
1
4
6