Great Plains 2000 Operator Manual - Manual (Page 27)

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Section 3 Adjustments
12, 15 and 20 Foot Series Three-Point Drills 118-389M-A 2012-03-27
Great Plains Mfg., Inc.
With sequence valve. If markers are tied together with an
optional sequence valve, adjust folding speed with hex ad-
justment screws on the sequence-valve body. See Figure
3-5. There is one adjustment screw for raising speed (1)
and one for lowering speed (2). Identify adjustment screws
by markings stamped in valve body.
With tractor idling at a normal operating speed, adjust
marker folding to a safe speed.Turn adjustment screws
clockwise to decrease folding speed and counterclock-
wise to increase folding speed. Excessive folding speed
could damage markers and void the warranty.
After adjusting the folding speed, tighten jam nuts on hex
adjustment screws to hold settings.
Figure 3-5
Speed Adjustment, Sequence Valve
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of air.
If the markers fold in jerky, uneven motions, follow these
steps.
!
CAUTION
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics fail.
Never allow anyone near the drill when folding or unfolding the
markers.
!
WARNING
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin. Check all hydraulic lines and fittings before
applying pressure. Fluid escaping from a very small hole can be
almost invisible. Use paper or cardboard, not body parts, and
wear heavy gloves to check for suspected leaks. If injured, seek
medical assistance from a doctor that is familiar with this type
of injury. Foreign fluids in the tissue must be surgically removed
within a few hours or gangrene will result.
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1. Check that tractor hydraulic reservoir is full.
2. With both markers lowered into field position, loosen
hydraulic-hose fittings at rod and base ends of marker
cylinders. If applicable, loosen fittings on back side of
sequence valve.
3. With tractor idling, activate tractor hydraulic valve until
oil seeps out around a loosened fitting. Tighten that fit-
ting.
4. Reactivate tractor hydraulic valve until oil seeps out
around another loosened fitting. Tighten that fitting.
Repeat process until all loosened fittings have been
bled and tightened.
Disk Scraper Adjustment
To keep the double-disk openers turning freely, dirt scrap-
ers are mounted between the disks to clean as the disks
rotate. A scraper is shown in Figure 3-6.
As field conditions vary, you may need to adjust the scrap-
ers. In damp conditions, lower the scrapers. If openers are
not turning freely, raise the scrapers. To adjust, loosen the
3/8-inch bolt and move scraper as needed.
Figure 3-6
Disk Scraper Adjustment
IMPORTANT: Never bleed an O-ring fitting. Instead,
bleed a nearby pipe or JIC fitting.
IMPORTANT: JIC fittings do not require high torque.
JIC and O-ring fittings do not require sealant. Always
use liquid pipe sealant when adding or replacing pipe-
thread fittings. To avoid cracking hydraulic fittings from
over tightening, do not use plastic sealant tape.
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