Great Plains 1625AHL Operator Manual - Manual (Page 78)

74 1625AH Table of Contents Index Great Plains Manufacturing, Inc.
411-020M Table of Contents Index 2014-04-21
Unit-Mounted Coulter 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 holes
arranged in a staggered pattern in the coulter mount.
Refer to Figure 65 (depicting a left hand mount - the hole
pattern is identical for the right hand mount)
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
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. Drape a tarp over tines or dismount row cleaner
(if present) to reduce risk of injury.
2. Determine the present opener and coulter depths.
3. Note which mount 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 65).
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 65
25AH Unit-Mounted Coulter
36238
3
3
Figure 66
Coulter Blade Mounting Holes
36239
1
4
6
2
3
5
3
1
2
3
4
5
6