Great Plains NTA2000D Operator Manual - Manual (Page 18)

16 NTA 2000D 148-632M 9/13/2006
Great Plains Mfg., Inc.
If drill is unfolded:
1. Make sure the wing sections are on the ground. Loos-
en the fittings at the base end of each coulter fold cyl-
inder and at the rod end of each opener fold cylinder.
Supply oil as to fold the drill. As oil begins to seep from
the loosened fittings, tighten those fittings. Do not fold
the wing sections yet.
2. Make sure the wing sections are still on the ground.
Loosen the fittings at the rod end of each coulter fold
cylinder and at the base end of each opener fold cyl-
inder. Supply oil as to unfold the drill. As oil begins to
seep from the loosened fittings, tighten those fittings.
Continue supplying oil as to completely unfold the drill
for at least five seconds.
3. Fold the drill.
!
CAUTION!
Use extreme caution because some sudden dropping of the
wings may occur if a small amount of air still remained in the
cylinders.
4. Fold and unfold the drill three more times.
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of air.
If the markers fold in jerky, uneven motion, 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.
Check that tractor hydraulic reservoir is full. Marker hy-
draulic capacity is 1 1/2 gallons (5.8 liters).
1. With both markers lowered into field position, unpin
rod end of each cylinder and block cylinder up so it can
be extended and retracted safely and without contact-
ing anything. Loosen hydraulic-hose fittings at rod and
base ends of marker cylinders. Loosen fittings on
back side of sequence valve.
IMPORTANT: 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 fit-
ting.
IMPORTANT: JIC fittings do not require high torque. JIC
and O-ring fittings do not require sealant. Always use liq-
uid pipe sealant when adding or replacing pipe-thread fit-
tings. 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.
4. Cycle both cylinders completely in and out at least
three times to completely purge air from cylinders and
hoses.
5. Repin cylinders and cycle markers at least three
times.