Unit-mounted coulter adjustments – Great Plains 3N4010HDA Operator Manual User Manual
Page 46
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3N-4010HDA
Great Plains Manufacturing, Inc.
196-444M
2013-09-24
Unit-Mounted Coulter Adjustments
Unit-mounted coulters are an optional alternative to
frame-mounted coulters. Only one type of coulter may be
installed. See page 69 for ordering information.
Note: Unit-Mount Coulters are not factory-installed.
Check alignment and depth prior to first use.
Note: For frame-mounted coulter adjustments, see
Coulter Depth Adjustment
The ideal operating depth for unit-mounted coulters is
1
⁄
4
in 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 38 and Figure 39
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
in-above depth. See the table below.
4.
Remove the
5
⁄
8
-11 x 4in bolt, lock washer and nut (
in Figure 38).
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 oper-
ating depth, replace the coulter blade.
Hole
No.
Depth of (new) coulter blade relative
to (new) opener blades
1in above
5
⁄
8
in above
1
⁄
4
in above
0 (factory standard hole)
3
⁄
8
in below
3
⁄
4
in below
Figure 38
10HD Series Unit-Mounted Coulter
22817
7
Figure 39
Coulter Blade Mounting Holes
23288
1
2
5
4
3
6
7
2
3
5
1
4
6