sitrex DM/4, Список запасных частей и сборка, использование и обслуживание

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After they have been used the first time, the disks, knives and relevant parts to fasten them must
be controlled regularly every 15-20 working hours. More frequent checks will have to be made if
mowing is carried out on stoney ground and after impact with an obstacle.
The oval disks are splined to a shaft and have to be positioned so that the main axle is at right
angles with those next to it (fig.15).
The knives are fastened by means of a special self-tapping screw and an M12 nut (fig.16); the
nut must be tightened with a 16 kgm (160 Nm) torque.
Cupped washer 1 (fig.17) must be mounted with its concavity facing downwards. The self-locking
nut 2 must be tightened with a dynamometric spanner set at 32 kgm (320 Nm).
Pay attention to the direction of disk rotation. Worn knives can be replaced by carefully looking at
fig.15 (A is the work moving direction); the second cutter (if still in good condition) can be used
by putting it back turned up-down at the same side
of the disk. If worn knives are used to mow, the cut
will be less precise and more power will be used.
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The knives should be replaced when:
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the width of the knife at point B=1 cm (0.4
inches) from the edge of the disk is 3/4 of the
original width A (fig.18).
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the oval shape of the hole is more than a
distance of C=2mm (0.08 inches) of the size of
the original hole (fig.19).
The clamp parts should be replaced when:
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the screw to fasten the knives is bent or too
worn out below the head (fig.20).
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the self-tapping layer 1 of the screw to fasten
the knives is missing or too worn out; we advise
changing the screw after it has been tightened
5 times.
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the clamp screw is worn down where it holds
the knife to a distance of E higher than or equal
to 3 mm (0.12 inches) (fig.22).
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the height of the lock nut at any point
whatsoever is less than or equal to 1/2 of the
total nut height (fig.23).
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