Assembly (Fig. 56)
ARMATURE
ASSEMBLY
PRESS FIXTURE
MUST PRESS
AGAINST
NOTE: After the motor has been disassembled, it is
recommended that a new commutator end head bear-
ingbeinstalled because theremoved bearing mayhave
been damaged during disassembly. Although the bear-
ing may appear and feel good, the bearing could be ”bri-
nelled” (races or balls deformed) and may exhibit noise
andvibrationproblemsorfailwithin arelatively shortpe-
riod of service. When installing new bearing, always
press against the race that is absorbing the pressure or
bearing damage may occur.
OUTER RACE
BEARING AND
RETAINING RING
INSTALLED
IN END HEAD
BEARING
PRESS FIXTURE
MUST HOLD
END HEAD
MUST BE HELD
STATIONARY
INNER RACE
STATIONARY
1.
After servicing the commutator and brushes, re--as-
Figure 61
semble the wiring in the commutator end head as origi-
nally found. Ensure the wiring does not contact metal
androtatingparts.Also,makesurethatthewiringallows
the brushes to move unrestricted in the brush holders.
1
2
2.
pressingonthebearingouterraceonly(Fig.61).Secure
bearing with retaining ring.
Press a new bearing into the commutator end head,
3
4
5
3.
field assembly and secure with four (4) bolts. Torque
Position the commutator end head to the frame and
Figure 62
4.
5.
bolts from 120 to 140 in--lb (13.6 to 15.8 N--m).
1.
2.
3.
Terminal
Lower nut
Flat washer
Insulating washer
Motor housing
4.
5.
Ensure the brushes are pushed out of the way.
While supporting the inner--race of the bearing in
commutator end head, carefully press the armature into
the end head and bearing assembly (Fig. 61).
2
6.
Position brushes in brush holders and carefully re-
1
lease the brush springs allowing the brushes to contact
the commutator. Make sure brush shunts do not inter-
fere with spring movement.
4
7.
the headband on the motor.
Repair or replace the headband if damaged. Install
3
8.
Make sure that lower nuts are properly tightened on
traction motor terminals (Fig. 62 and 63). Lower nuts on
F1andF2terminals shouldbetorquedfrom50to60in--
lb (5.7 to 6.8 N--m). Lower nuts on A1 and A2 terminals
should be torqued from 110 to 140 in--lb (12.4 to 15.8
N--m).
Figure 63
3.
4.
1.
2.
A2 terminal
F2 terminal
F1 terminal
A1 terminal
Workman MDE
Electrical System
Page 3 -- 41
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