Great Plains NP3000A Operator Manual - Manual (Page 52)

48 NP3000 and NP3000A Table of Contents Index Great Plains Manufacturing, Inc.
407-613M Table of Contents Index 2014-04-22
Raising/Lowering Applicator
Operate the tractor hitch in “position” or “depth” control
mode, regardless of implement hitch type.
The implement may be raised and lowered while folded.
Raise/Lower
Refer to Figure 21 and Figure 22
The implement front height is controlled entirely by the
lower two tractor 3-point arms
(not visible in figure).
The rear height of the implement is controlled by two
lift-assist cylinders
. Spacers are provided to limit the
“lowered” position.
The lift-assist and wing fold cylinders share the same
hydraulic circuit. When correctly adjusted, the wings
partially fold just prior to lift. Self-engaging lock channels
prevent complete folding during field operations. The
lowered height of the wings is controlled by manually-set
wing gauge wheels (page 84).
Raising (Field, Unfolded)
These instructions presume that the intention is to lift
without folding, that the implement is unfolded, and that
the wing fold locks auto-engaged at the last unfold, and
have not been reset. If the intention is to lift and fold, see
“Folding” on page 52.
1. Open the lift-assist shut-off valve .
2. To raise the implement, first raise the tractor hitch.
This at least partially raises the coulters (and, if
completely stopped, raises them with a slight forward
motion to avoid plugging).
3. Extend the lift-assist cylinders (normally with an
Extend operation of the tractor remote).
The wings fold partially. When arrested by the stops,
the rear lift-assist cylinders extend. This feature
prevents wing droop in field turns.
4. When fully raised, set both hitch and lift/fold remotes
to Neutral.
Raising (When Folded)
If the implement is already folded:
• Raise it with the 2-point and lift-assist circuits in any
order. The fold circuits are supplied with oil, but since
the wings are already folded, they do not move. The
adjustment valve (page 161) then diverts all oil to the
lift cylinders.
• Hold at raised with Neutral circuits.
• Install rear lift-assist lock channels (page 50).
• Deploy parking stands (page 42).
If the implement is unfolded, and the intention is to lift
and fold, see “Folding” on page 52.
Equipment Damage Risk:
Do not fully fold or fully unfold while lowered. Perform
complete fold and unfold only when fully raised. When
lowered, the wing coulters near the wing pivot may be
damaged by bending or ground dragging.
Gradual Crushing Hazard:
Do not rely on hydraulic pressure alone to keep the implement
raised. Use parking stands (page 42) and transport/lift locks
(page 50) when working around a raised implement. The
tractor hitch may settle. The bypass orifices in the implement
lift-assist re-phasing system cause it to slowly lower.
Figure 21
Lift System
31524
3
4
3
4
5
Figure 22
Lift-Assist Valve (Closed)
32041
5