Adjustment Of Springs In Centre Section - Hardi ALPHA EVO II EcoDrive Instruction Book

Adjustment of Springs in Centre Section

Description of Spring Function
The adjustable spring arrangement in the centre section will level out
abrupt movements of the spray boom. If different field conditions
appear, for example hilly or sloping fields, the spring arrangement may
need manual adjustment.
When driving over an uneven area in the field, or when turning at
headlands, the boom will move up or down compared to the direction
of the wheel axle of the sprayer.
The boom movement can be adjusted by moving the spring to another
position.
Adjustment of Boom Movement
On the top bracket there are 5 hole positions, where for the springs
controlling each boom wing can be mounted:
Hole closest to centre (1)
Middle hole (3)
Hole farthest away from centre (5)
μ
ATTENTION! If AutoHeight for the boom is installed, the springs
should be mounted in the top holes (1).
Moving Spring Position
1. Loosen the rigging screw (A) by turning the nuts (B). Before loosening the rigging screw, note the positions of the nuts
and the tension in the spring - this should be the same after moving the spring position.
2. Dismount the upper bolt (shown here in hole position 3) and move the spring arrangement to the selected hole 1-5.
3. Refit the bolt and tighten the rigging screw. The rigging screw should be plenty tightened - however the spring should
not be stretched out further compared to the tension in the previous position.
4. Both springs should have the same tension, when the boom is levered.
Replacement of Spring
1. Adjust the rigging screw (A) by loosening the nuts (B), until there is no more tension in the spring.
2. Dismount the spring.
3. Mount the new spring and refit the rigging screw.
4. Tighten the nuts plenty to the create the same spring tension as before.
Less straightening of the boom.
The boom is moving only slightly and working
towards a a horizontal position (pendulum style).
Suitable for flat and even fields.
Medium straightening of the boom.
The boom movement is at a medium level.
Powerful straightening of the boom.
The boom will follow the direction of the wheel axle
to some extent (trapeze style).
Suitable for sloping fields.
6 - Maintenance
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