2019-03-14
196-538M
3N-40P
Adjustments
78
Frame-Mounted Coulter Force
Coulter springs are set to 400 pounds (181 kg). In
normal operation at target running depth, the spring is at
full extension. It compresses briefly as obstructions are
encountered.
•
In heavy no-till conditions, you may observe the
springs in compression most of the time. This means
that the blades are not reaching the desired coulter
depth. If adequate drill weight is available, you can
increase the spring down-force to compensate.
•
In light but rocky conditions, the factory spring
setting may be higher than needed. You can extend
blade life by reducing the force at which the blades
ride up over obstructions.
To adjust the coulter spring:
1. Raise the drill and install transport locks. See “
2. Determine the new spring length
desired. See the
table at right.
3. Measure the current length of the spring(s) to be
changed. If already shorter than
9
3
/
4
inches (24.8 cm), or longer than
10
1
/
4
inches (26 cm), do not further adjust them.
4. Loosen the jam nut
.
5. Rotate the adjuster nut
until the spring is at the
new length. Tighten the jam nut.
If all springs are continuously in compression, the
coulters can lift the wing frames off the ground (at the
wheels), resulting in uneven coulter depth and/or
uneven seed depth. If high forces are required, frame
weights are probably required.
Do use spring lengths shorter than 9.75 in (24.8 cm). It may
contribute to premature parts failure which will not be covered
by warranty.
Figure 96
Frame-Mounted Coulter Spring
27139
Spring Length
Force at Blade
10.25 inch (26.0 cm)
300 pounds (136 kg)
10.00 inch (25.4 cm)
400 pounds (181 kg)
9.75 inch (24.8 cm)
525 pounds (238 kg)
1
2
3