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Probable causes: axial shocks, load shocks, defec-
tive shaft coupling, gear tooth damage, cross talk
from other defective bearings.
If possible, lubricate
the bearing and
check the reading at
the same time.
When lubricating,
check that the lubri-
cant penetrates into
the bearing.
No
The reading does not drop.
Probable causes: disturbances from loose bearing cap,
protecting cover or similar items.
Can also be caused by: Large bearing damage.
The reading drops to normal level and does not increase
again. Cause: foreign particles in the bearing which have
been removed by the new lubricant.
Have normal values
been previous ob-
served?
NOTE: Be suspicious
when sudden drastic
changes in readings
occur.
Probable causes:
• Insufficient lubrica-
tion, possibly in
com-bination with
minor bearing dam-
age
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
Yes
Probable causes:
• Bearing damage.
Measure in shorter
in-tervals, follow the
pro-gress of the dam-
age .
• Foreign particles in
the lubricant.
Can also be caused by
disturbance from loose
bearing cap, protect-
ing cover or similar
items.
If possible, isolate the
source of disturbance
The reading drops to normal level and does not increase
again. Cause: insufficient lubrication.
The reading does not drop.
Probably causes:
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
The reading drops but the max. value increases again
within a few hours.
Probable causes: insufficient lubrication which probably
has caused minor bearing damage.
The reading does not drop.
Probably causes:
• Incorrect bearing installation
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
The reading drops but the dBm increases again within a
few hours.
Probable causes: insufficient lubrication which probably
has caused minor bearing damage.
The reading drops to normal level and does not increase
again. Cause: insufficient lubrication.
Probably causes:
• The bearing’s inner ring is slipping on the shaft.
• The bearing’s outer ring is slipping in the housing.
• The reading has been taken just after lubricating a
grease lubricated bearing.
If possible, lubricate
the bearing and
check the reading at
the same time.
When lubricating,
check that the lubri-
cant penetrates into
the bearing.
Probable causes:
• Incorrect bearing
installation
• Insufficient lubrica-
tion possibly in com-
bination with minor
bearing damage
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
Yes
No
If possible, lubricate
the bearing and
check the reading at
the same time.
When lubricating,
check that the lubri-
cant penetrates into
the bearing.
Yes
• Is the instrument and the
transducer working ok?
• Is the measuring point cor-
rect?
• Is the adapter or the trans-
ducer correctly installed?
• Is the machine in operation?
The reading drops but increases again within a few hours.
Cause: bearing damage.
Shorten measuring intervals to follow the progress of the
damage.