Great Plains 3N-3020P Operator Manual - Manual (Page 22)

3N-3010P and 3N-3020P
196-248M 4/23/2010
20
If drill fold cylinders have not been extended:
1. Crack fittings at base end of cylinders. Extend
cylinders to purge air from system.
2. Crack fittings at rod end of cylinders. Retract
cylinders to purge remaining air from system.
3. Tighten all fittings. Extend cylinders and pin to
drill lugs.
If drill cylinders have been extended:
1. Unfold drill so that fold cylinders are com-
pletely 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 mo-
tions, 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 tractor hydraulic reservoir is full.
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 fit-
ting. 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.