Maintenance
9.2 Inspection and maintenance
1LE7 shaft heights 71 ... 315
94
Operating Instructions, 04/2022, A5E51689275A-AA
9.2.7
Re-greasing
For motors with regreasing system, relubrication intervals, grease quantity and grease grade
are provided on the lubricant plate. Additional data can be taken from the main motor rating
plate.
Grade of grease for standard motors UNIREX N3 - ESSO.
Below are the list of approved greases that can be used:
Table 9- 4
Approved rolling bearing greases for vertical and horizontal types of construction
Manufacturer
Grease type
Shell
Shell Gadus S2 V100 3
ExxonMobil/Esso
Unirex N3
ExxonMobil/Esso
Mobilgrease XHP 103
Note
It is not permissible to mix different types of grease. If an alternative grease is being used,
make sure that the old grease has been cleaned from all grease chambers and grease paths
(bearing covers, bearing, grease pipe and grease nipple).
Prolonged storage periods reduce the useful lifetime of the bearing grease. Check the
condition of the grease if the equipment has been in storage for more than 12 months. If the
grease is found to have lost oil content or to be contaminated, the motor must be
immediately relubricated before commissioning. For information on permanently-greased
bearings, please refer to the section titled Rolling bearings (Page 98).
Procedure
To relubricate the rolling bearings, proceed as follows:
1.
Clean the grease nipples at the drive end and non-drive end.
2.
Press-in the specified grease and amount of grease according to the data stamped on the
lubrication plate.
–
Please observe the information on the rating and lubricant plates.
–
Regreasing should be carried out when the motor is running (max. 3600 rpm).
The bearing temperature can rise significantly at first, and then drops to the normal value
again when the excess grease is displaced out of the bearing.
WARNING
Rotor can fall 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 material damage.
Support or relieve the rotor when carrying out work with the motor in a vertical position.
