Great Plains 20 Series DrillS Assembly Instructions - Manual (Page 3)

3 4/9/04 12, 15 and 20 Series Drills Folding Markers 113-477M
Great Plains Mfg., Inc.
Assembly
Bleeding Marker Hydraulics
!
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 pres-
sure. 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 tis-
sue must be surgically removed within a few hours or gangrene will re-
sult.
1. Check that tractor hydraulic reservoir is full.
2. With both markers lowered into field position, loosen hy-
draulic-hose fittings at rod and base ends of marker cylin-
ders. If applicable, loosen fittings on back side of sequence
valve.
Figure 5
Hydraulic Assembly, Markers with Sequence Valve
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3. With tractor idling, activate tractor hydraulic valve until oil
seeps out around a loosened fitting. Tighten that fitting.
4. Reactivate tractor hydraulic valve until oil seeps out around
another loosened fitting. Tighten that fitting. Repeat process
until all loosened fitting have been bled and tightened.
5. Adjust marker folding to a safe speed. Refer to Marker Ad-
justment, "Adjustments," in the operator’s manual.
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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Hydraulic Hose From: To Valve Port:
Left-Hand Cylinder, Rod End C1
Left-Hand Cylinder, Base End R1
Right-Hand Cylinder, Rod End C2
Right-Hand Cylinder, Base End R2