Seite
7
von
10
7.3
Wear & vibrations
To prevent abnormal wear & vibration, one should:
a.
Take care that the tension of the belt or the chain is not too high;
b.
Check whether the mounting of directly coupled machines is correct;
c.
Check whether the foundation bolts to fasten the motor and the slide rails are
tightly fixed.
7.4
Greasing
Before the motor leaves the factory, the bearings are filled with a high quality
Lithium base grease. This grase can be mixed with most of the commonly used ball
bearing greases that are lithium-based so that nearly every grease can be used for
regreasing.
Motors from frame size 56 up to frame size 250 are fitted with both sides sealed ball
bearings ( 2RZ ) those filled with grea
se by the bearing manufacturer “for life time”.
The bearings for those frame sizes without regreasing-divices are completely free of
maintenance. Regular checks can be limited only towards temperature and noise.
Motors from frame sizes 280 up to frame size 400 are equipped with open bearings,
that are filled for 2/3 when the motor leaves the factory. The drive-end shields are
fitted with bearing covers. The lubrication must take place when the machine is
running. The old grease ejects from the grease valve thus maintaining the correct
level and avoiding overfilling which would be harmful.
7.5
Replacement of ball or roller bearing
When a bearing has to be replaced, the old bearing has to be removed from the shaft
with proper tools in order not to damage the shaft. Thereupon the bearing location
on the shaft has to be cleaned and checked thoroughly.
After the new ball bearing resp. the inner ring of aroller bearing has been heated-up
to ca. 80°C till 90°C, it must be mounted on the shaft very soon. If necessary, a short
pipe that fits onto the inner bearing ring can be used to push the bearing to its corret
position.
In no case, it is allowed to blow on the outer ring of the bearing.
Do not mount the end shield until the bearing has cooled down.
