Great Plains LC40 Operator Manual - Manual (Page 32)

28 LC40 Table of Contents Index Great Plains Manufacturing, Inc.
591-049M Table of Contents Index 2014-07-21
Row Unit Down Pressure (Springs)
For working in tire tracks you can increase spring down
pressure at individual rows.
Refer to Figure 21
This table provides the down-force values with tool bar
and parallel arms level with the ground.
To adjust spring pressure:
1. Measure the current bolt reveal at each spring.
Measure from the top of the cast spring plug to the
bottom of the bolt head (top of washer).
2. Determine the current row force from the table
above. Select the new down-force desired.
3. Loosen the jam nut at the cast plug.
4. Turn the bolt head to obtain the new reveal value.
Make the same adjustment to both springs.
Down Force Bolt Reveal
Pounds kg Inches mm
350 160 3.50
a
a. Factory setting.
89
390 175 3.25 83
450 205 3.00 76
490 220 2.75 70
540 245 2.50 64
Equipment Damage Risks:
Adjusting pressure at the springs for all rows is not
recommended. Row tool damage may result and/or tractor
rear wheels may slip. Reducing spring pressure below factory
values may result in bolt thread stripping.
Figure 21
Down-Pressure Springs
34878
1
3
2
1
1
2
3