Great Plains 3P4025AH Operator Manual - Manual (Page 59)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 55
2014-07-29 Table of Contents Index 411-099M
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
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 48 and Figure 49
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 the
adjustment. 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
inch-above depth. See the table
below.
4. Remove the
5 ⁄
8
-11
× 4 inch bolt, lock washer and nut
( in Figure 48).
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
operating depth, replace coulter.
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 48
25 Series Unit-Mounted Coulter
29124
7
Figure 49
Coulter Blade Mounting Holes
29125
1
2
5
4
3
6
7
2
3
5
1
4
6