Great Plains DVN8552 Operator Manual - Manual (Page 22)

18 8321-8552DV Table of Contents Index Great Plains Manufacturing, Inc.
550-353M 2014-02-12
General Operation and In-Field
Adjustments
1. Remove the transport pins and unfold machine.
Make sure the fold cylinders are fully extended to
allow the wings to fully flex in the field.
2. If possible have someone observe the machine dur-
ing first time operation for levelness, front to rear and
wings to center frame. Adjust each as needed. For
front to rear, either extend or shorten the length of
the turnbuckle on the self-leveler. Never run the
machine with the back lower (deeper) than the front.
To adjust the machine from side to side, use the eye-
bolt on each wing, See “First Time Field Adjust-
ments” on page 14. The gauge wheels (if equipped)
should be set in field position to be 1/2” to 1 1/2” off
the ground.
3. The ideal working speed for the Discovator is 5 1/2 to
6 1/2 mph. Working too slow may cause plugging,
poor incorporation or mixing of crop residue and
reduced weed kill. Running too fast may cause
streaks in chemical incorporation and ridging.
4. The Discovator is designed as a secondary tillage
tool and is designed to leave a finished seedbed fol-
lowing some form of fall or spring tillage. For best
results, if at all possible, run the machine at a slight
angle of the rows. This will improve trash flow and
help spread the residue more evenly throughout the
field.
5. When you have the machine set to the desired work-
ing depth, set the depth stop slide on the depth con-
trol bar. This is located at the front of the machine on
the brace bar. This will maintain a constant depth
each time after raising and lowering the machine.
6. If after setting the depth stop, the detent on the trac-
tor kicks out before the stop contacts the button on
the depth stop, slow the hydraulic flow speed down.
If the problem persists, contact the factory service
representative for the possible adjustments. Do not
try the rebound valve without first contacting the fac-
tory service rep.
7. Adjust the drag to leave the desired results while
maintaining the trash flow through the drag.
Scraper Settings
The scrapers are set at the factory but should be
checked periodically and may need re-adjusted as fol-
lows:
• Disc scrapers will need the bolts (rigid scraper) or u-
bolts (spring scraper) loosened up and slid into blade
until they just touch the blade, and torqued to specs.
• Coulter scrapers u-bolts will need loosened and scrap-
ers centered between coulter blades, and torqued to
specs.
Rear Attachment Settings
Spike Drag Settings
Refer to Figure 11
8.
On the spike drag, start with 5 links hanging from the
chain in drag arm bottom slot. (This is the starting point
for worst conditions). The cleaner the ground, the shorter
the pull chain may be pulled up. On the spike drag, one
of the links in the first row of angles is turned over. This
allows the trash to start flowing through the drag easier
by changing the angle of the first row of teeth. Always
make sure that the drag is never pulling off of the hang
chains. If so, shorten pull chains.
Figure 11
Spike Drag Settings
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