Great Plains NP4000 40-foot Operator Manual - Manual (Page 40)

36 NP4000 Table of Contents Index Great Plains Manufacturing, Inc.
407-776M Table of Contents Index 2012-03-28
Lower While Folded
These steps presume that the intention is parking or
storage, on lift-assist locks and parking stands.
1. Verify that the lift lock channels are installed on the
lift-assist cylinders (page 31).
2. Retract the lift-assist circuit to lower the lift-assist
cylinders onto their locks.
3. Raise the tractor three-point hitch until the implement
mainframe is level front-to-rear, or the front is slightly
higher than the rear. Set the hitch circuit to Neutral.
Shut off the tractor.
4. Deploy the parking stands. Pin them so that the
frame will be level when lowered onto the stands.
5. Start the tractor. Lower the tractor hitch until the
implement is supported by the parking stands.
Lower While Unfolded
These steps presume that the intention is to park, store
or service the implement, and that lift-assist lock and
parking stands are to be used. For field lower and field
adjustments, see topic “Field Lower” following.
1. Verify that all lock channels are in place on wing fold
cylinders.
2. To keep all coulters off the ground when unfolded
and lowered, crank the gauge wheels to full
extension (page 55).
3. Retract the fold circuit until inner and outer wing fold
is stopped by lock channels.
4. Set the fold circuit to Neutral.
5. Extend the lift-assist circuit to fully raise the
implement at rear. Set circuit to Neutral.
6. Raise the tractor three-point hitch until the implement
mainframe is level front-to-rear, or the front is slightly
higher than the rear. Set the hitch circuit to Neutral.
Shut off the tractor.
7. Install the lock channels at the lift-assist cylinders
(page 31).
8. Deploy the parking stands. Pin them so that the
frame will be level when lowered onto the stands.
9. Start the tractor. Retract the lift-assist circuit until the
cylinders rest on the lock channels.
10. Lower the hitch until the implement rests on the
parking stands at front.
11. Extend the fold circuit until the gauge wheels touch
the ground, then set the circuit to Float.
Field Lower
These steps are for lowering in the field after initial
line-up and after turns. Lift-assist lock channels are
presumed to have been replaced by spacers. The
down-pressure/weight transfer system is presumed to be
adjusted.
The key objectives for an optimal lowering are:
• avoid side loads on coulter discs or applicator tips by
avoiding lowering with drooped wing tips, and
• avoid applicator plugging by avoiding any reverse
motion of the applicator tips at the ground.
Being in slow forward motion during lower avoids both of
these risks. The following instructions presume a
lowering while stationary.
1. Check that wings are partially folded against locks,
or at least level. If they are drooping, retract the fold
circuit to correct.
2. Lower the tractor 3-point hitch to the preset field
height. Set the hitch circuit to Position or Depth
Control.
3. Retract the lift-assist circuit until the cylinders rest on
the spacers. Set the lift-assist circuit to Float.
Note: You may also lower the hitch and lift-assist
simultaneously, but avoid lowering the lift-assist
before the hitch.
4. Pull forward.
5. Extend the fold circuit to level the wings. Set the
circuit to continuous for weight transfer.
Tip-Over and Crushing Hazard:
Never unhitch without using parking stands, particularly while
folded. A folded implement without parking stands deployed
will tip forward immediately upon unhitching. Anyone at the
hitch or in the tractor may be seriously injured or killed. The
tractor cab may be crushed.
Equipment Damage Risk:
Although it is possible to fully lower the implement while
folded (with parking stands in place or while hitched), this is
not recommended. This can place the full weight of the
machine on the center coulters, exceeding their spring
capability.