ThyssenKrupp Rothe Erde Manual Del Usuario página 18

18
Bearing inspection
®
Bearings without grease sampling ports
If there are no grease sampling ports provided
on the bearing, one or more grease samples
are taken at the seal. This area near a grease
nipple must be cleaned. The sample should
be taken preferably in the main working area
and/or offset 180° to it.
During regreasing at the prepared grease
nipple (without rotation of the bearing),
the first grease escaping from the sealing
lip is taken as the sample (figure 16). 3 ccm
are enough.
Note
the result may be falsified by contamination.
Figure 16: Taking a sample of grease from the sealing lip
Fe limit values
A limit value for Fe contamination in the
lubricant depends greatly on the operating
parameters and the lubrication intervals.
Depending on the application, the value can
be as high as 20 000 ppm.
Be careful when taking the sample or
Limit value
Working hours
Limit value
Figure 17: Wear curves
Wear curves
The diagrams show the increase in wear and the increases in
Fe particles and the PQ index as a function of the operating hours
(figure 17).
For standard applications see the values in tables 4 – 6 on page 13.
When the limit values are reached, please contact ThyssenKrupp
Rothe Erde.
Operating
hours
Operating
hours