Great Plains NP30A 30-foot Operator Manual - Manual (Page 96)

92 NP30A or NP40A Table of Contents Index Great Plains Manufacturing, Inc.
407-502M Table of Contents Index 2014-05-20
Spring Knife Release Depth
Refer to Figure 74
Knife release depth
is set by tool bar height above
the ground. Control of height depends on hitch type.
Pull-Type applicators have an adjustable hydraulic
down-stop for controlling tool bar height (page 85).
2-Point and 3-Point applicators rely on tractor hitch
height for center tool bar height. Wing tool bar height is
set to match the center using a crank-assisted manual
adjustment (page 86).
Design shoe operating depth is 4 to 6 in (10 to 15 cm).
Operation at and below 8 in (20 cm) is not
recommended, as a high rate of bolt shears (page 95) is
likely.
Spring Knife Depth Reference Information
Overall height of the tool bar base to knife shoe base is:
30.25 in (76.8 cm)
Liquid NH
3
is released from the tube at:
3 ⁄
4
in (19 mm) above the shoe base.
For a precise release depth, subtract this amount from
the total knife depth
.
Chemical Hazard:
Adjust height dry. Make this adjustment before charging the
metering system with anhydrous ammonia, or after thoroughly
discharging the system. With the knives or tines out of the
ground, there could otherwise be releases of ammonia at
dangerous concentrations.
Figure 74
Spring Knife Application Depth
36006
2
1
3
4
1 2
3
4
1