Great Plains 3S-4010HDF Operator Manual - Manual (Page 52)

48 3S-4010HD and 3S-4010HDF Great Plains Manufacturing, Inc.
196-522M 03/28/2012 E
Adjusting 10HD-Series Down-Force
Refer to Figure 55
An adjuster cam sets row unit spring down pressure indi-
vidually 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 drill with-
out coulters. About 120 lbs (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 wing.
With factory-installed frame-mounted coulters, only 2
springs are installed, to provide finer down-force control
at the opener disks (right table).
With frame-mounted coulters installed, they also lift
against wing mass, effectively reducing the maximum
cam settings without weights, but also reducing the work-
load of the openers, so down force settings may be
lower. Test, without seeding, in your conditions, to deter-
mine optimal down-force settings, and whether additional
weight is required.
Refer to Figure 55
To adjust down pressure, use an adjustable or open-end
1
1 ⁄
8
in (29mm) wrench.
1. Raise the drill. Although this adjustment can be
made with the drill lowered, the springs will be in ten-
sion, 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.
Cam Down-Force Settings
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Note: Do not set all rows so high that planting becomes
uneven or gauge wheels skid or lift off ground.
Figure 55
Row Unit Minimum (one)
and Maximum (six)
27065
1
6
Standard (4) Springs Springs Reduced for FMC
Pounds 7.5in 10in Pounds 7.5in 10in
zero zero
one 250 lbs (113 kg) one 185 lbs (84 kg)
two 275 lbs (125 kg) two 198 lbs (90 kg)
three 310 lbs (141 kg) three 215 lbs (98 kg)
four 370 lbs (168 kg) Note 1 four 245 lbs (111 kg) Note 2
five 430 lbs (195 kg) Note 1 Note 1 five 275 lbs (125 kg) Note 2 Note 2
six 490 lbs (222 kg) Note 1 Note 1 six 305 lbs (138 kg) Note 2 Note 2
(tip) Do Not Use (tip) Do Not Use
Note 1: Setting to this down-force on all rows of a drill may require Markers and/or Weight sets
Cam
Notch
Cam
Notch
(out of notch)
Maintenance Only
Note 2: Setting this down-force on all rows require Markers and/or Weight sets due to frame-mounted coulters