55
Technical data are subject to change without notice.
ISO 9001 certified. © Copyright SPM 1996-9. 71411.B
SPM Instrument AB • Box 4 • S-645 21 Strängnäs • Sweden
Tel +46 152 22500 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
Probable causes: axial shocks, load shocks, defective
shaft coupling, gear tooth damage, cross talk from other
defective bearings.
If possible, lubricate the
bearing and check the
reading at the same
time.
Check, when lubrica-
ting, that the lubricant
penetrates into the bea-
ring.
No
The reading does not drop.
Probable causes: disturbances from loose bearing cap,
protecting cover or similar items.
Can also be caused by: Exessive bearing damage.
The reading drops but increases again within a few hours.
Cause: bearing damage.
The progress of the damage should be followed with shorter test
intervals.
The reading drops to normal level and does not increase again.
Cause: foreign particles in the bearing which have been remo-
ved by the lubrication.
Have normal previous
values been ob-ser-
ved?
NOTE: Be suspicious
when sudden drastic
changes in readings
are recorded.
Probable causes:
• Insufficient lubrication
possibly in combina-
tion with minor bearing
damage
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
Yes
Probable causes:
• Bearing damage.
The progress of the
damage should be fol-
lowed with shorter test
intervals.
• Foreign particles in
the lubricant.
Can also be caused by:
disturbances from loose
bearing cap, protecting
cover or similar items.
If possible, isolate the
source of disturbance
and retest.
The reading drops to normal level and does not increase again.
Cause: finsufficient lubrication.
The reading does not drop.
Probably causes:
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
The reading does not drop.
Probably causes:
• Incorrect bearing installation
• Cavitation in pumps
• Mechanical rubbing
• Gear tooth damage
The reading drops to normal level and does not increase again.
Cause: finsufficient 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 lubrication
(grease lubricated bearing).
If possible, lubricate the
bearing and check the
reading at the same
time.
Check, when lubrica-
ting, that the lubricant
penetrates into the bea-
ring.
Probable causes:
• Incorrect bearing in-
stallation
• Insufficient lubrication
possibly in combina-
tion 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.
Check, when lubrica-
ting, that the lubricant
penetrates into the bea-
ring.
Yes
• Is the instrument and the
transducer working OK?
• Is the pick-up point selected
properly?
• Is the adapter or the transducer
installed properly?
• Is the machine in operation?
The reading drops but increases again within a few hours.
Probable causes: insufficant lubrication which probably has
caused minor bearing damage.
The reading drops but increases again within a few hours.
Probable causes: insufficant lubrication which probably has
caused minor bearing damage.
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