Device for bearing diagnostics using shock pulse method
Operation manual
28
Section 4 Operation
f) Improper lubrication (Figure 4-14).
High dBc value indicates bearing operation without lubrication, dBm and dBc
values differ slightly, possible reasons are:
Insufficient lubrication (lubrication of poor quality, use of waste, resin
or condensated oil);
Nonsymmetrical installation or bending;
Emergency shutdown
Change oil or increase oil supply.
Figure 4-14. Improper lubrication mode.
g) Cavitation or similar problems (Figure 4-15).
Shock pulses in case of pump cavitation are the same as in case of improper
lubrication. In this case the highest shock pulse values will be on the pump
housing and on all the bearings.
