
196-366m
Preparation and Setup
Great Plains
| | 4/22/19
23
If drill cylinders have been extended:
1. Unfold drill so that fold cylinders are completely
extended. Lower drill to ground. Unpin rod ends of
fold cylinders.
2. Crack fittings on rod end of cylinders. Purge air from
cylinders by retracting cylinder rods.
3. Crack fittings at base end of cylinders. Extend
cylinders to purge remaining air from system.
4. Tighten all fittings. Repin cylinders to drill.
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.
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.
Check that the tractor hydraulic reservoir is fill.
1. 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.
Never bleed an O-ring fitting. Instead, bleed a nearby pipe or
JIC fitting.
2. With tractor idling, activate tractor hydraulic valve
until oil seeps out around a loosened fitting. Tighten
that fitting.
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.
3. 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.
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