ThyssenKrupp Rothe Erde Manual Del Usuario página 14

14
Bearing inspection
®
Measuring the axial reduction
Where tilting clearance measurements are
not possible we recommend the axial reduc-
tion measurement method. In this case the
center of the load combinations lies within
the race diameter of the bearing. The loading
principle is shown in fi gure 6.
Possible load center
Figure 6: Loading principle of the axial reduction measurement
The measurements are taken between the
lower companion structure and the bearing
ring which is bolted to the superstructure
(fi gures 7, 8). The procedure is similar to
that for measuring the tilting clearance:
• Here too, record reference values when
the equipment is put into operation.
• Mark the measuring points around the
circumference starting from a defi ned
position.
Repeat the tilting clearance or axial reduction
measurements under the same conditions
at appropriate intervals, after fi rst checking
the bearing fastening bolts. The difference
between the current measurement and the
reference measurement is the wear which
has occurred in the intervening period. If the
wear values show a rising trend, you should
carry out the measurements more often.
F
a
Figure 7: Basic setup for measuring the axial reduction
with a depth gauge
Figure 8: Basic setup for measuring the axial reduction
with a feeler gauge
Advantage Given conclusive assessment
of the bearing's condition, worn parts can
be replaced in good time.
In conjunction with optimum spare parts
management, it is thus possible to avoid in-
cidents of damage and lengthy downtimes.
Note If the permissible wear values
(tables 4, 5 and 6 on page 13) are exceeded,
we recommend that the equipment should
be shut down.
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