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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Rolling bearings maintenance and checking
Design solutions
The standard design solution for horizontal machines use ball bearings on both sides. With these exceptions:
2-pole motors of the welded frame AMDR series that have a cylindrical roller bearing on the NDE side.
AMDT motors, size 710 - 900 that have cylindrical roller bearings on both sides, plus an additional axial locking bearing
on the DE side.
Vertical machines have ball bearings (similar to those used on the horizontal machines) on the DE side (low side), whereas on
the NDE side ball bearings or angular contact ball bearings can be used according to the weight and velocity of the rotor.
For vertical 4 and more poles cast iron frame AMDRg 355 & 400 machines the rotor weight is withstood by DE ball bearing.
Check on the specific technical documentation for any non-standard solutions or for working conditions that could require
different lubrication intervals.
Sheet No.
3AAM101040 E
Rev. B
01.2023
Page 4 of 11
Issued by: MOLM
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