Great Plains 3N-4020 Operator Manual - Manual (Page 106)

102 3N-4010F/3N-4010HDF/3N-4020F Table of Contents Index Great Plains Manufacturing, Inc.
196-359M Table of Contents Index 2013-10-29
Level Frame Side to Side
All frame sections must be level to maintain even seed-
ing depth. Before using the drill in the field, follow these
steps to make sure the drill is level side-to-side.
Periodic frame-leveling adjustments should not be nec-
essary, but if you are having problems with uneven
depth, check drill levelness and follow these procedures.
Complete the steps at “Bleeding Fold Hydraulics” on
page 106, before proceeding.
Refer to Figure 142
1. Locate the threaded eye bolt at the base end of
the wing caster wheel cylinders. The eye bolt is
locked in place by jam nuts
. Observe the amount
of thread exposed above the upper nut and below
the lower nut. If the exposed threads are roughly
equal, no initial adjustment is needed. Go to step 3.
2. If the exposed threads above and below the nuts are
not equal, loosen and adjust the jam nuts until the
amount of exposed thread is about the same above
and below. Repeat for other end of drill.
3. Move the drill to a level area. With the drill unfolded,
raise the drill to its highest position with the lift cylin-
ders. With the tractor idling, rephase the cylinders by
holding the hydraulic lever on for an additional 30
seconds. Immediately lower the boxes until the
coulters and openers are just ready to touch the
ground.
4. Move the eye bolts until the openers on the outside
end of the drill are the same height as the center
openers.
Note: Eye-bolt adjustments are easier if the drill is first
lowered to the ground to remove some of the force
on the cylinders.
5. Repeat the steps above until the drill is level
end-to-end when drilling in actual seeding condi-
tions.
Level Frame Front to Rear
Level the drill front-to-rear with eye bolts located on the
rear axle only.
6. Repeat the steps “Level Frame Side to Side” on
page 102 using only the rear cylinders, until the drill
is level front-to-rear when drilling in actual seeding
conditions.
Note: When drill is level, opener bodies are at level or
slightly higher at rear.
Note: Drill must be level front to rear in actual planting
use or row plugging will occur. Adjusting wheel
depth stop too low or excess opener spring force
can cause the front of drill to roll forward when
planting. Conventional till ground can also cause
drill to run low in the front if wheel depth is set too
low.
7. Have an assistant check front to rear level while
planting by observing the drill from a safe distance.
Drill should run with box and frame level or slightly
lower in the front.
4
Figure 142
Frame Level Eyebolt
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