9.3.4.1 Replacing bearings in explosion-proof machines
• When changing the bearings, renew the sealing rings and only use original Siemens spare
parts.
• For radial sealing rings with dust protection lip (DIN 3760-AS), completely ll the spaces
(100%) in the sealing ring as well as in the bearing shield hub with a suitable grease.
9.3.4.2 Fitting bearings
Note
Bearing seals for explosion-protected machines
For explosion-protected machines, only use the original replacement and repair parts.
Sealing the bearings
Note the following details:
• Shaft sealing rings are used to seal machines at the rotor shaft.
– For V rings, comply with the assembly dimension.
• Use the specied bearings.
• Ensure that the bearing sealing disks are in the correct position.
• Insert the elements for bearing preloading at the correct end.
• Fixed bearings can have a locking ring or bearing cover.
• Seal the bearing cap screws with the appropriate gaskets or with grease.
• Do not interchange the position of the bearing covers (DE and NDE or inner and outer).
Danger as a result of rotor falling out
If the motor is in a vertical position, the rotor can fall out while work is being performed on the
locating bearing. This can result in death, serious injury or damage.
• Support or unload the rotor when carrying out work with the machine in a vertical position.
Installing rolling bearings
• Extreme caution and attention to cleanliness are vital when installing rolling bearings.
Observe the correct assembly sequence of the components.
• Attach all components with the specied tightening torques (Page169).
Maintenance
9.3Corrective maintenance
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 131
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