GREAT PLAINS 8321DV Guide

FIELDADJUSTMENTGUIDE
Document #TLUS200C-0001A
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Document # TLUS200C-0001A
Tillage
Disc-O-Vator
Proper servicing and adjustment is key to the long life of all farm equipment. With careful and systematic
inspection of equipment, costly maintenance, time and repair can be avoided. The following information
will assist with recommended servicing and adjustments:
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Models Affected:8321DV, 8324DV, 8326DV, 8328DV, 8333DV, 8537DV, 8544DV, 8548DV, 8552DV, 8315DVN,
8318DVN, 8321DVN, 8324DVN
Date: October 20, 2015
General Information

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Hydraulic Hose Hookup:
Great Plains hydraulic hoses have color coded handle
grips to help hookup hoses to the tractor outlets. Hoses
with the same color use the same remote.
Use the following table to assist with hooking up the
implement:
Color Hydraulic Function
Black Lift (2 hoses)
Green Fold (2 hoses)
Red Gang (2 hoses)
“Brakes” Hydraulic trailer brakes (option)
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Hydraulic hookup example
Leveling The Machine Front To Rear:
Note: Prior to leveling the machine front to back, remove
the transport locks and unfold the machine on a level sur-
face.
1) Lower the machine so that the sweeps are 2 to 3
inches off of the ground on the center frame.
2) Using a wrench loosen the jam nut (1).
3) Adjust the turnbuckle at either adjustment nut (2) so
that the front of the machine runs slightly deeper then the
back.
4) Once properly adjusted, re-tighten the jam nut (1).
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Leveling The Machine Side To Side:
Wings should be adjusted to match the center section of
the machine.
1) Adjust the eye bolt on each wing to match the center
section. Lengthening the bolt will shallow up the wings
while shortening the bolt will allow the wings to run
deeper.
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Document #TLUS200C-0001A
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Disc Gang Adjustment:
Disc gangs are designed to run 1/2” to 1” shallower than
the cultivator sweeps. At this depth, the sweeps are
allowed to work in firm ground which improves trash
flow.
1) Adjust the depth gauge to read +1/2” to +1”. Do not
run the disc or coulter gangs in the RED ZONE. Note:
Disc blades should only be ran in the RED ZONE when
using 18” blades that are nearing the end of their wear
life.
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Adjusting The Depth Stop:
1) Lower the machine to the desired working depth and
set the depth stop at the front of the machine to ensure
consistent depth every pass. Note: Once set, if an
adjustment is necessary, one full turn of the depth stop
handle is equivalent to 1/4” of depth.
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Spike Drag Setting:
If the spike drag attachment is present, start with five
chain links hanging from the bottom drag arm slot (this is
a starting point for the worst conditions). The cleaner the
ground, the shorter the pull chain may be pulled.
On the spike drag, one of the links in the first row of
angles is turned over to allow trash to start flowing eas-
ier. Note: Make sure that the spike drag is never pulling
off of the hang chains. If so, shorten the pull chains.
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HD Spike & Reel Settings:
On HD spike drags, start with five chain links hanging
from the bottom drag arm slot (this is a starting point for
the worst conditions). The cleaner the ground, the
shorter the pull chain may be pulled. Note: Make sure
that the drag is never pulling off of the hang chains. If so,
shorten the pull chains.
1) Adjust the nut (3) so that the spring (4) is just making
contact with the front plate (5).
2) Turn the nut (3) and additional 1” further on the spring
rod to set the springs pre-load.
3) Lengthen the turnbuckle (6) to adjust the front mini
shank (7) to run more aggressive or shorten the turn-
buckle to run more passive.
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