9.3.1
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 (suffix 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
Horizontal coupling 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
9.3 Corrective maintenance
1PC134, 1PC136 crane motors SH 132 ... 315
90
Operating Instructions, 02/2019, A5E43212221A
