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Rigidity of the spring can be adjusted by the pre-straining nuts under the spring (picture 18). By turning the upper nut
anti-clockwise the strain increases and by turning the lower nut it is locked in place. In double spring designs both
springs must be adjusted to same pre-strain. Control the length of the spring during adjusting to avoid exceeding the
minimum length.
The nut on top of the spring does not need to be adjusted. This nut affects the angle of the blade frame with the wing
which has been set in line at the factory. By tightening the nut, the blade frame can be tilted backwards. If adjusting the
angle of the blade frame the length of the spring needs to be controlled not to exceed the limit. Length of the spring
needs to be 275 mm in minimum after all adjustments.
Picture 18 Adjusting the spring
Tension nut
Locking nut
Adjusting blade angle
