Great Plains 3N4010HDA Operator Manual - Manual (Page 49)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 45
2013-09-24 Table of Contents Index 196-444M
Row Unit Down Pressure
10HDP Series Down-Pressure
Refer to Figure 44
An adjuster cam sets row unit spring down pressure
individually for each row unit. This is useful for
penetrating hard soil and planting in tire tracks.
The notes in the left table below are based on a air drill
implement without coulters. About 120 pounds (54 kg) of
the down-force is the weight of the row unit itself. The
additional force is due to the springs lifting against the
mass of the air drill implement.
Test, without seeding, in your conditions, to determine
optimal down-force settings.
To adjust down pressure, use an adjustable or open-end
1
1 ⁄
8
inch (29 mm) wrench.
1. Raise the air drill implement. Although this
adjustment can be made with the air drill implement
lowered, the springs will be in tension, and will
require more effort. The extra force required may
also damage tools.
2. Put tractor in Park and shut it off.
3. Position wrench on hex nut weldment.
4. Pull upper spring link back.
5. Move the adjustment cam to the new setting on the
spring adjust bar.
2-Spring 10HD Cam Down-Force Settings
These settings apply to 2009+ air drill implements, or
updated older air drill implements, that have two parallel
arm springs per row. 4-Spring 10HD Cam Down-Force Settings
These settings apply to older air drill implements, not yet
updated
a
, that have four parallel arm springs per row.
Note: With 4-spring rows, do not set all rows so high that
planting becomes uneven or gauge wheels lift off
ground.
Figure 44:10HDP:
Row Unit Minimum (one)
and Maximum (six)
27065
1
6
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 125 55
two 140 60
three 155 70
four 185 85
five 215 100
six 245 110
tip Do Not Use
36026
a. Contac your Great Plains dealer for update kit information.
Cam Notch Pounds Kilograms
zero (out of notch) Lock-Up & Maintenance
one 250 115
two 275 125
three 310 140
four 370 170
five 430 195
six 490 220
tip Do Not Use
31452