Great Plains NP30A 30-foot Operator Manual - Manual (Page 56)

52 NP30A or NP40A Table of Contents Index Great Plains Manufacturing, Inc.
407-502M Table of Contents Index 2014-05-20
Raise/Lower: 2012- & 3-Section 2-Point
These instructions apply to 3-section applicators and
2012- 5-section applicator. For 2013+ 5-section
applicators, see page 54.
Refer to Figure 35 (depicting an NP40L, which has the same
hitch and hydraulic system)
The front height of the applicator center section is
controlled by the lower two tractor 3-point arms
(not
visible in figure).
The rear height of the applicator is controlled by two
lift-assist cylinders
. Spacers are provided to limit the
“lowered” position (page 38).
Raising 2012-/3S 2-Point (Field, Unfolded)
These instructions presume that the intention is to lift
without folding, that the applicator 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 3S and 2012- 5S 2-Point” on page 61.
When raising in the field, the wings tend to droop. Use
the fold circuit to counter this.
1. Retract the fold cylinder circuit until the wing locks
stop motion, or the outside row knives or tines just
start to lift out of the ground. Set the circuit to
Neutral.
2. Raise the tractor hitch. This raises the knives or tines
with a slight forward motion, preventing plugging of
the ammonia tube outlets.
3. Extend the lift-assist cylinders (normally with an
Extend operation of the tractor remote).
Note: Holding the lift-assist circuit at raised for a few
seconds re-phases the cylinders.
4. When fully raised, set all remotes to Neutral.
Raising 2012-/3S 2-Point (When Folded)
Refer to Figure 35 (depicting an NP3000, which has the same
weight transfer hydraulic system)
If the applicator is already folded:
1. Close the weight-transfer shut-off valve .
2. Raise it with the 2-point and lift-assist circuits in any
order.
3. Hold at raised with Neutral circuits.
4. Install rear lift-assist lock channels (page 44).
5. Deploy parking stands (page 36).
If the applicator is unfolded, and the intention is to lift and
fold, see “Folding 3S and 2012- 5S 2-Point” on
page 61.
Anhydrous Ammonia Exposure Hazard:
When raising in field, be facing into the wind or be turning
up-wind. Even if NH
3
flow was stopped some distance before
the lift point, the knives or tines will emit NH
3
vapor when out
of the ground, and for some time.
Gradual Crushing Hazard:
Do not rely on hydraulic pressure alone to keep the applicator
raised. Use parking stands (page 36) and transport/lift locks
(page 44) when working around a raised applicator. The
tractor hitch may settle. The bypass orifices in the applicator
lift-assist re-phasing system cause it to slowly lower.
Figure 35
2-Point Lift System
31524
3
4
3
4
5
Figure 36
Weight-Transfer Shut-Off Valve
32041
5