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4.4 Operation and adjustment
On the SAL disc harrow, the position of the individual working units must be
preadjusted before starting work in the field. It is also necessary to level the machine
longitudinally with the tractor's top link and transversely with the lower link hanger. The
first working run should then be made to set the optimum working speed and correct the
adjustment based on an assessment of the correct operation of the individual units.
The
working speed should be 10 - 15 km/h.
In a well-adjusted machine, the frame must be
parallel to the ground and all working units should penetrate the soil equally across the
entire working width.
4.4.1 Adjusting the shaft position
The position of the shaft can be adjusted in 2 ways, changing its offset from the
discs and the working depth, these are described below:
The
working depth
is determined by locking the shaft arms using locating pins
with locating plates on the ladder at the desired height. Particular care must be taken to
ensure that the pins are fitted equally on both sides.
Fig. 7 Adjusting the working depth of the shaft.
Caution ! When setting the working depth, take into account the sinking of
the shaft into the ground depending on the condition of the surface and
the type of crop.
Distance of the shaft from the discs
- extend the unlocked arms to the desired
distance and then secure with screws on the handle. However, it must be remembered
that moving the shaft backwards causes the machine to lengthen and worsens the
longitudinal balance of the tractor.
