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13.4 INSPECTING AND REINSTALLING THE AUGER
The auger is made of stainless steel. In the area of the screen, the auger blades have been plated with
a special material according to a special process, see Fig. 13-14.
Inspect the auger for any damage and
clean it. The axial contact surface of
the auger mount shown in Fig. 13-14
and the feather key grooves must be
free of solid matter and must not ex-
hibit any damage or markings; other-
wise the auger will rotate out of true,
thereby damaging the screen.
If both the auger and the screen are in
good condition [see the following sec-
tion for the criteria to evaluate the au-
ger and the screen], the auger can be
installed.
Fig. 13-14 Auger plated with special material and hub mount,
new condition
Insert the auger carefully into the separator without striking the feather keys against the axial contact
surface of the auger. This could cause the auger to exhibit axial eccentricity. Turn the auger until the
feather keys snap into the feather key grooves of the auger. Then press the auger upward and screw it
with the auger bolt again (tightening torque 200 Nm).
Check the auger again for axial eccentricity. This
should be less than 1 mm, otherwise the screen will be
damaged. Fig. 13-15 shows the axial eccentricity
check at the factory. If the axial eccentricity is larger,
inspect the auger and fastening elements again for
damage, marks and soiling.
Fig. 13-15 Inspection of the auger axial eccentricity
Then readjust the scraping bolts. To do this, loosen
the lock nuts and slowly adjust the scraping bolts while
turning the auger until the bolts scrape against the au-
ger. Then turn the bolts back approx. 30° and lock the
lock nuts. The scraping bolts must be readjusted every
4 weeks.
Abb.13-16: Abstreifschrauben
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