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Earthing discs
The function of earthing discs, which can be acquired as accessories, is to improve the earthing
of seeds. Earthing disc is located in terms of coulters slightly on the side, behind the coulter, and
it guides the soil to the groove left by the sowing coulter.
The earthing disc unit is coulter sledge specific. Behind each coulter sledge a leaf spring will be
attached, which, in its lower end, has attached two discs, one for each seed coulter.
The earthing unit is attached to the coulter sledge from the loop in front of the leaf spring. The
lower position limit is placed on the underside of the coulter sledge with an installed screw.
Raising the seed and fertilizer sower up, the earhing discs can fall downward until the leaf springs
coincide with the earthing discs and hit the surface of stop screws.
In the rear end of coulter sledge are 9 holes. These holes are for the adjustment of earthing unit.
By placing a control pin above the leaf spring of the earthing disc, it is possible to adjust the
weighing force which makes the earthing disc to function. The lower the pin is located, the greater
the force by which the earthing disc operates. If the earthing disc is below the leaf spring, it will
the function as a lower position limit. Earthing will then function only by its own force. When
needed the earthings can be lifted fully up, removed from functioning with this control pin.
The angle of earthing discs is also adjustable. By loosening the nut on the side of axis, the axis
of the disc can be turned and the working angle changes. The nut must be carefully tightened
after the adjustment.
NOTE! EXERCISE CAUTION WHEN LIFTING A MACHINE WITH EARTHING DISCS!
•
If the electric control of the lifting and lowering circuit power is not connected, the machine
can in principle, be lifted as far up as the lifting cylinders permit. In this case, the seed
and fertilizer sower rear wheels touch the earthing discs and as a result there will be
damage to the tires and to the earthing disc units. If you must lift the equipment so, that
the electric power is not connected, stop the lifting movement well before the tires start to
touch the earthing discs.
•
Also, when the electric control of lifting is connected, check the upper limit of lifting. Lifting
must finish well before the wheels are close to the earthing discs. Adjust the lifting upper
limit magnet so that the space between the wheels and earthing discs is at least 10 cm.
Also note that when the machine coulter weighing or sowing depth is changed the settings of
earthing discs also change.
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