Tomberlin 2010 E-Merge - Bearing Inspection; Inspection of the Speed Sensor Magnet; Mounting of the Bearing; Removal of the Bearing

Electric Motor
MERGE 12-6
Chapter 12
CAUTION
• To inspect the elasticity of the brush spring, it is strictly prohibited to excessively extend the
spring. Excessive force may damage the spring.
NOTE: Once the brush is removed, the replacing one should be mounted. This can ensure that
the connecting terminal and brush be properly aligned in the transmission gear. For the
mounting of brush, please refer to "Assembly of the electric motor".
Once one brush is replaced, all the other brushes should also be replaced at the same time.
Never replace only two of them.
Brushes should be mounted on the same transmission gear, and the two brushes connected
should be symmetrically mounted.
Bearing inspection
1. Wipe off the carbon dust in the bearing with a clean cloth. Inspect the bearing through manual turn
and inspection of the clearance in axial direction（A）and radial direction (B) (see Fig 12-6).
2. The bearing should be replaced with new one in case the bearing noise is too loud, unable to rotate
smoothly or the clearance is too large. Inspect the bearing, and replace it in case the bearing rusts,
is abraded or cracks or in case the color of the metal of the bearing changes abnormally. Do not
remove the bearing from the armature shaft unless for replacement purpose.
Removal of the bearing
1. Secure the bearing puller to the bearing
○
15 , and pull the bearing from the armature shaft. Support
the shaft so that it will not fall off when the bearing is removed (see Fig 12-8). Reject the bearing.
Mounting of the bearing
Press the new bearing
○
15 against the armature（see Fig 12-7). Use only the hand arbor press that
exerts pressure on the inside race.
NOTE: Before pressing the bearing to the armature, see to it to secure the large washer
○
20 to
the armature shaft（see Fig 12-7).
The arbor of which the outside diameter is less than 5/8 inch (16mm）should be used to press the
bearing to the armature.
Inspection of the speed sensor magnet
Inspect the speed sensor magnet
○
18 for abrasion or crack. Replace the magnet when necessary（see
Fig 12-7).