Great Plains NP3000A Operator Manual - Manual (Page 125)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 121
2014-04-22 Table of Contents Index 407-613M
NH
3
Coulter Spring Setting
If the NH
3
coulter is ever disassembled for maintenance,
reset the spring length to factory setting. Raise the
applicator to ensure that the coulter is relaxed.
Refer to Figure 76
At the rear end of the spring
, loosen the outer jam nut.
Adjust the inner nut for a spring length of:
10 3 ⁄
8
inches (26.4 cm)
This corresponds to a vertical trip force of
1557 pounds (705 kg).
Machine Damage Risk:
Do not attempt to compensate for extreme field conditions by
adjusting the springs to higher forces (shorter springs).
Higher trip force is not likely to improve penetration, and
results in premature blade wear, higher risk of blade damage,
and may simply lift the applicator.
2
1
Figure 76
Coulter Spring Length
34929
1
2
2