Great Plains NP30A 30-foot Operator Manual - Manual (Page 89)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 85
2014-05-20 Table of Contents Index 407-502M
Frame Height Adjustments
Hydraulic Depth Stop Adjustment
This applies to pull-type applicators only. The lift system
includes an adjustable stop valve, on the left gauge
wheel, to fix the height of the opener frame when the
applicator is lowered.
Note: The change in knife/tine depth is not linear and can
be greater than the change in down-stop
adjustment. Make adjustments in small amounts.
Refer to Figure 66
To adjust the stop height (assuming a desired
2 in (2.5 cm) application depth):
1. Move to smooth level ground with soil as similar as
possible to field conditions.
2. Using grease pen or similar, mark the desired soil
level on a knife or tine near the left outside row, but
not in the tire tracks (knives and tines in tracks run
shallower than other rows).
3. Lower the applicator until the knives or tines just
touch the ground. Hold that height by setting the lift
circuit to Neutral.
4. Using the knob on the stop, adjust the stop
position until the plunger just touches the stop
clevis .
5. Raise and then fully lower the applicator.
6. Pull forward 10 feet (3 m) and stop.
7. Measure the depth at which the knives or tines are
running. If the knives or tines are at the desired
depth, no further adjustment is necessary. Skip to
step 11.
8. Raise the applicator and set the lift circuit to neutral.
9. Adjust the stop up (to increase depth) or down (to
reduce depth). Adjust in small increments.
10. Check the new setting starting at step 5.
11. Raise and lower several times and confirm that the
applicator stops consistently at the new height.
Make sure the applicator is level and the lift system bled and
re-phased before adjusting the tool bar height. If the center
section does not consistently stop at the set height, or the
wings do not run at the same height as the center, the lift
system may have air or be out of phase (above), or the wings
may not be level. See “Leveling Applicator” on page 37.
Figure 66
Hydraulic Depth Stop
31521
1
2
3
Crushing Hazard:
Make all down-stop adjustments with circuit in Neutral and
applicator raised (actuator plunger not in contact with
down-stop). Loosening the down-stop with circuit active and
applicator lowered results in rapid lowering of the frame.
1
2
3