Siemens induction motors- generators cgii ユーザーズマニュアル

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Sleeve Bearing 
1120 Frame (See Figure 7) 
1.  Check replacement bearings for nicks or shipping 

damage.  Do not scrape. 

2.  Carefully remove the bearing housing cap by first 

lifting straight up, then pulling away from the 
bearing area. 

3.  Remove top half of bearing liner. 
4.  Remove the bolts at the split line of the oil ring, 

disengage the dowels, and remove the oil ring. 

5. Remove bearing temperature probes if so 

equipped. 

6.  Raise the shaft slightly and support it. 
7.  Rotate the lower bearing half 180° and remove the 

lower half of the bearing liner. 

8.  Reassemble, reversing the steps above.  Apply 

sealant. (See MAINTENANCE, SEALING PARTS 
for proper sealing of this bearing design).Be 
careful not to disturb or jam the seals when 
replacing the upper half of the bearing capsule. 

9.  Lubricate. Turn motor by hand to be sure of proper 

fit and oil ring operation. 

10. Start motor without load and check oil ring 

operation. 

 
End Float – Sleeve Bearings 
Control of rotor end float in sleeve bearing motors is 
maintained in the drive end bearing.  The total end 
float is 0.5 inch.  On the 500, 580, 680 and 800 
frames, the bearings are located axially by shims 
between the bearing bushing and the bearing capsule 
shoulders .  On the 1120 frame, the shims are located 
between the bearing housing mounting flange and the 
bearing bracket.  The shims permit the bearing to be 
adjusted axially to maintain coincidence of electrical 
and mechanical center.  Any adjustment of the axial 
position of one bearing should be accompanied by the 
same axial adjustment of the opposite end bearing. 
 
The coupling should limit the end float of the shaft to 
±0.18 inch from the mechanical center.  The limited 
end float coupling prevents the rotor from rubbing 
against the bearing shoulders during operation. 
 
 

 
 
 
 
 
 
 

 

Figure 7.  Sleeve Bearing Construction 

1120 Frame.