Multiva Optima T Series, Operation And Maintenance Manual, Page: 20 / 41

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The relation between the front and rear levelling boards in Optima T harrows can be quickly changed by
using the crank adjustment at the back end of the harrow. The adjustment position can be seen from
the scale.
4.8. Using the rear harrow
The purpose of the rear harrow is to even out the ridges caused by the s-tine harrow and to sort out the
soil material in the tilled layer. The rear harrow sorts out the small crumbs to the bottom of the tilled
layer and moves the large ones to the surface. As a result, the tilled layer does not evaporate the
moisture and endures the effects of rain without slaking.
Angle adjustment:
The angle of the rear harrow is adjusted from the harrow fixing piece using the adjusting pin (point 1).
The rear harrow has three different positions. When the tines of the rear harrow are at their most vertical
position in relation to the ground, the harrow sorts out the fine material most efficiently to seeding
depth and produces the most even result. By making the angle of the rear harrow less steep, the
passing of plant residue is improved. If necessary, the rear harrow can be locked up by turning the tines
backward to the front and locking them to this position with an adjustment pin or by setting the lower
limiter sufficiently high.
Height adjustment:
The height is adjusted so that the tines of the harrow even out the ridges left by the s-tines, but do not
leave any grooves. The lowest position can be limited with position of the pins 2. Both ends of the
harrow section must be set to the same level.
The tilling power of the harrow can be increased by limiting the upwards movement by setting another
pin above the bar. This should be used carefully and only on even fields.
NB. Harrow must be able to
rise up so that it will never have to bear the weight of the harrow. It is recommended to place the upper
pins to the highest position holes and leave the harrow to work on its own weight.