Adjustments – Great Plains YP Unit-Mount Coulter User Manual
Page 7
2012-08-27
204-141M
Great Plains Manufacturing, Inc.
5
Adjustments
The ideal operating depth for coulters is
1
⁄
4
inch (6 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 3 and Figure 4
Raise unit mount coulter 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 adjustment. Be careful around the front end of row
units. Row clear tines and coulter blades may be sharp.
To adjust coulter depth:
1.
Dismount row cleaner (if present) to reduce risk of
injury.
2.
Determine the present opener and coulter depths.
3.
Note which bracket hole the coulter is presently
using.
4.
Determine which new hole will position the coulter
closer to the
1
⁄
4
inch-above depth. See the table
below. If none, don’t move it.
5.
Remove the
5
⁄
8
-11
× 4 inch bolt, lock washer and
nut (
in Figure 3).
6.
Move the blade to the new position. Insert the bolt,
and tighten on the lock washer and nut.
7.
Re-adjust openers, if installed.
If a worn coulter cannot be adjusted to satisfactory
operating depth, replace coulter blade.
Hole
Number
Depth of (new) coulter blade
relative to (new) opener blades
1 inch (25 mm) above
5
⁄
8
inch (16 mm) above
1
⁄
4
inch (6 mm) above
0
3
⁄
8
inch (9.5 mm) below
3
⁄
4
inch (19 mm) below
Figure 3
25 Series Unit-Mounted Coulter
29124
7
15
Figure 4
Coulter Blade Mounting Holes
23288
1
4
6
2
3
5
15
2
3
5
1
4
6