Great Plains NP4000B Operator Manual - Manual (Page 59)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 55
2014-05-14 Table of Contents Index 417-199M
Field Lower
These steps are for lowering in the field after initial
line-up and after turns. Lift-assist lock channels
(page 50) are presumed to have been replaced by
spacers (page 43). The down-pressure/weight transfer
system (page 92) is presumed to be adjusted.
The key objectives for an optimal lowering are:
• avoid side loads on coulter discs or tines by avoiding
lowering with drooped wing tips, and
• avoid tine plugging by avoiding any reverse motion of
the tines at the ground.
Being in slow forward motion during lower avoids both of
these risks. The following instructions presume a
lowering while stationary.
Refer to Figure 30
1.
Verify that the FOLD / FIELD switch is set to
FIELD
2. Check that wings are partially folded in field lift, or at
least level. If they are drooping, retract the fold
cylinders to correct.
3. Lower the tractor 3-point hitch to the preset field
height. Set the hitch circuit to Position or Depth
Control.
4. Extend the fold/lift circuit to lower the wings below
level into down-pressure mode, and to retract the
lift-assist cylinders to their spacers.
Note: You may lower the hitch and lift-assist
simultaneously, but avoid lowering the lift-assist
before the hitch.
5. Pull forward.
6. Leave the fold/lift circuit active in the lower/unfold
position, to supply oil to the down-pressure system.
Figure 30
Switch for Field Lower
34918