Great Plains NP30A 30-foot Operator Manual - Manual (Page 42)

38 NP30A or NP40A Table of Contents Index Great Plains Manufacturing, Inc.
407-502M Table of Contents Index 2014-05-20
3-Point Leveling
Refer to Figure 18
Leveling is controlled entirely by the tractor hitch.
Pull-Type Hitch Leveling
Refer to Figure 20
With the knives or tines 4 inches into the ground, the tool
bar height is:
24 inches (61 cm)
and normally requires a pull-type hitch height of:
16.75 inches (42.5 cm)
measured from the bottom of the tongue to the ground.
Refer to Figure 19
To obtain the correct height, and a level tongue, remove
the two hitch bolts
, and reposition the fertilizer
applicator hitch on the tongue.
The hitch can be inverted in the tongue for extreme
height changes.
2-Point Front-to-Back Level (Spacers)
The rear lift-assist assembly must be set to match the
gauge wheels and 2-point hitch in front. Lift-assist
lowered height is controlled by (provided) spacers on the
lift cylinder rods.
To set:
1. Lower applicator until lift assist wheels are just off
the ground.
2. Raise applicator until wheels touch ground just firmly
enough to resist spinning.
Refer to Figure 21
3.
Insert a combination of spacers to fill the space on
the rod between the cylinder end and clevis.
4. Raise and lower applicator. Pull forward. Check
knife/tine depth and front-to-back level. Adjust
spacers as required to achieve application depth.
Sudden Hitch Slump or Failure Risks:
Always have two bolts through two holes on both hitch and
tongue. Never rely on a single bolt.
Figure 19
Hitch Height Adjustment
16865
3
4
1
Figure 20
Pull-Type Leveling
31080
2
1
2
3
4
Figure 21
Lift Assist Lowered Height
31636
6
5
5
6