DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
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Maintenance<br />
[ID 585]<br />
6.3.6 Assembling the bearings<br />
General<br />
Fitting the bearings<br />
Note<br />
Take great care and pay attention to cleanliness when fitting and assembling the<br />
bearings.<br />
Pay attention to the correct assignment of the bearings.<br />
To fit bearings, heat the ball bearings and inner rings of the cylindrical roller<br />
bearings to about 100°C in oil or air and then press them onto the shaft at the<br />
bearing inner ring as far as the shaft shoulder. Fill the bearings with the specified<br />
grease so that they are flush (cf. section on "Grease types").<br />
Notice<br />
Avoid any heavy blows that might damage the bearings.<br />
Check that the existing sealing rings are in the proper condition. Renew them if<br />
they no longer provide a proper seal.<br />
In addition, please observe the following installation conditions:<br />
•= Thoroughly saturate new felt rings in high-viscosity oil (lubricating oil to DIN<br />
51517-C100) heated to about 100 °C before fitting in the bearing covers. The<br />
design of the rings should be such that the shaft slides easily in them but is still<br />
well enclosed by them.<br />
•= When installing outboard V-rings, note that the V-ring is in the correct axial<br />
position when the end face of the bearing cover is flush with the outer edge of<br />
the V-ring. The use of a suitable auxiliary disc for assembly purposes is<br />
recommended.<br />
•= To protect the V-ring against mechanical effects in special cases there may be<br />
an additional sheet-metal protecting ring fitted in the outer bearing cap (or in the<br />
bearing end shield). The protecting ring should be inserted in such a way that<br />
the ring is still sufficiently preloaded and that one of its two slots coincides with<br />
the water drain slot provided at the low point of its seat in the bearing cap (or<br />
bearing shield assembly).<br />
•= If rotary shaft seals are fitted without spiral springs, the replacement part must<br />
also be fitted without springs.<br />
•= In the case of a tacho-generator with an inboard V-ring at the outer bearing<br />
cover, the V-ring must sit against the collar of the journal.<br />
SIEMENS AG T61160347010001 (DMHO V9)<br />
6-16 Operating instructions 1GG6286-0NA4.-1VV1-Z