6.Maintenance of Bearings
If not particularly prescribed , rolling bearings
lubricated with grease are usually adopted for motors. Except close-type ball bearings ,
all other bearings are of open type so as to prevent from being over-greased by
facilitating the injection and discharge of grease. Tips of maintenance are listed and
explained below :
6.2 Specifications , applications and constructions of ball and roller bearings
6.3 After
stopping running for a long period (more than 2 months)
6.4 Grease supply
6.6 Problems of poor lubrication
6.7 Bearing
Diagnosis
6.8 Makers or brands of grease
6.9 Tips for assembling and disassembling
6.10 Sealed ball bearing
Additional supply of grease should be given to the newly procured motors before they are started running , or to the motors have stopped running for more than 2 months before they are re-started for running.
After motors having started running . additional grease should be supplied at intervals and according to the quantities shown on nameplate.
The discharged grease should be removed timely .
6.2 Specifications , applications and constructions of ball and roller bearings .
The information is given in the following table , except that for specially designed motors :
| Application | Non-drive end | Drive end | |
| Foot-mounted and belt coupled motors | Single shaft | Deep grooved ball bearing 63 ¡¼ ¡¼ CM |
Roller bearing NU3 ¡¼ ¡¼ CM |
| Foot-mounted motors coupled by coupling devices | ¡@ | Deep grooved ball bearing 63 ¡¼ ¡¼ CM |
Deep grooved ball bearing 6.3 ¡¼ ¡¼ CM |
| Vertical mounted motors coupled by coupling devices | Without or with light thrust | Deep grooved ball bearing 63 ¡¼ ¡¼ CM |
Roller bearing NU3 ¡¼ ¡¼ CM |
| Small thrust | Deep grooved ball bearing 73 ¡¼ ¡¼ ¡¼ |
Roller bearing NU3 ¡¼ ¡¼ CM |
|
| Medium thrust | Multiple-row bevel ball bearing 73 ¡¼ ¡¼ ¡¼ |
Roller bearing NU3 ¡¼ ¡¼ CM |
|
1 Grease nipple
8 Rolling bearing 2 Grease injection pipe 9 Shaft 3 Outer bearing-cap 10 Grease exit cover 4 Lock washer 11 Cover set-screw 5 Lock nut 12 Bolt 6 Bearing bracket 13 Bearing housing 7 Inner bearing-cap ¡@ ¡@
6.3 After stopping running for a long period (more than 2 months) :
Make sure checks described in item 1 and 4 have been completed .
After beginning running , grease should be injected at once . The quantity to be injected is shown on nameplate .
Temperature rise around bearings after beginning running .
Loudness and tone of bearing noise .
Noise and vibration of the motor .
Vibration of the bearing .
Check on receipt | Installation | Means of coupling | Running | Maintenance | Bearing maintenance | Vibration | Noise | back