Siemens SIMOTICS SD - Rolling Bearings

9.4.2 Rolling bearings
Refer to the rating plate or the catalog for the designations of the bearings being used.
Bearing lifetime
Prolonged storage periods reduce the useful lifetime of the bearing grease. For permanently
lubricated bearings, this reduces the bearing service life.
We recommend that the grease is replaced after a storage time of 12 months. Replace greased
bearings also in the case of closed bearings (su󹪟x 2Z or 2 RS). After 4 years in storage, generally
replace all rolling bearings and grease.
Replacing bearings
Recommended interval after which bearings are to be replaced under normal operating
conditions:
Table 9-4 Bearing replacement intervals
Ambient temperature Principle of operation Bearing replacement intervals
40°C Vertical coupled operation 20000 h
40°C Horizontal coupled operation 40000 h
40°C With axial and radial forces 20000 h
• Do not reuse bearings that have been removed.
• Remove the dirty spent grease from the bearing shield.
• Replace the existing grease with new grease.
• Replace the shaft seals when the bearings are replaced.
• Slightly grease the contact surfaces of the sealing lips.
Note
Special operating conditions
The operating hours are reduced, e.g.
• When machines are vertically mounted.
• High vibration and surge loads
• Frequent reversing operation
• Higher ambient temperatures.
• High speeds etc.
Maintenance
9.4Corrective maintenance
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A 107