CAMTECH/97/E/TM/3.0
TM Maintenance Handbook January’97
23
2.7.4.2
Commutator End
Similarly dismount the bearing inner ring, inner bearing stopper and bearing
outer ring at the same time, after removing CE end shield by exclusive tool
according the above procedure.
2.7.5
Cleaning of Armature Bearing
To clean the dismounted armature bearings, put them into a vessel contain-
ing kerosene heated upto about 60
°
without degreasing and leave them as they
are in kerosene for more than 10 minutes. After that, blow away sticking grease
with compressed air. Repeat the procedures more than twice, and then, wash
the bearings finally with a clean kerosene, and blow away adhering kerosene
completely with air.
For the final washing, always use new kerosene and do not use heavily oxi-
dised or foul one. Wash hands with a degreasing agent such as ethyl alcohol
carefully for preventing the bearings from getting rusty.
2.7.6
Checking of Armature Bearings
■
Check visually for roughness, scratch, bruise, discoloration, rust etc. on in-
ner & outer race too.
■
Check while moving the rollers for wear of retainer, looseness of rivets and
make sure that there is no abnormality.
■
If any abnormality observed in either inner or outer ring, replace with new
set of bearings.
■
Check for inner & outer ring of same serial number.
2.7.7
Maintenance of Rocker equipment
Disassemble the brush holders, insulators, rocker leads and rocker ring. In-
spect them visually check the arcing stud and knock pins, polish the insulating
rods. Measure the brush spring pressure and length of carbon brushes. The fol-
lowing points should be followed to improve life and service of the rocker assem-
bly during overhauling as shown in figure 2.6.
■
Remove old insulation of the rocker
leads and taped with kapton tape,
GMGS tape and fibre glass tape ac-
cordingly.
■
Provide Kapton tape & Nomex paper-
between rocker cleats.
■
Pre heat the leads at 150
°
C for four
hours.
Figure 2.6
