Toro Workman MDE 2008 Service Manual page 59

Assembly (Fig. 56)
NOTE: After the motor has been disassembled, it is
recommended that a new commutator end head bear-
ing be installed because the removed bearing may have
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
and vibration problems or fail within a relatively short pe-
riod of service. When installing new bearing, always
press against the race that is absorbing the pressure or
bearing damage may occur.
1. After servicing the commutator and brushes, re--as-
semble the wiring in the commutator end head as origi-
nally found. Ensure the wiring does not contact metal
and rotating parts. Also, make sure that the wiring allows
the brushes to move unrestricted in the brush holders.
2. Press a new bearing into the commutator end head,
pressing on the bearing outer race only (Fig. 61). Secure
bearing with retaining ring.
3. Position the commutator end head to the frame and
field assembly and secure with four (4) bolts. Torque
bolts from 120 to 140 in- -lb (13.6 to 15.8 N- -m).
4. Ensure the brushes are pushed out of the way.
5. 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).
6. Position brushes in brush holders and carefully re-
lease the brush springs allowing the brushes to contact
the commutator. Make sure brush shunts do not inter-
fere with spring movement.
7. Repair or replace the headband if damaged. Install
the headband on the motor.
8. Make sure that lower nuts are properly tightened on
traction motor terminals (Fig. 62 and 63). Lower nuts on
F1 and F2 terminals should be torqued from 50 to 60 in- -
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).
Workman MDE
PRESS FIXTURE
MUST PRESS
AGAINST
OUTER RACE
BEARING
END HEAD
MUST BE HELD
STATIONARY
1
3
5
1. Terminal
2. Lower nut
3. Flat washer
1. A2 terminal
2. F2 terminal
Page 3 - - 41
ARMATURE
ASSEMBLY
BEARING AND
RETAINING RING
INSTALLED
IN END HEAD
PRESS FIXTURE
MUST HOLD
INNER RACE
STATIONARY
Figure 61
2
4
Figure 62
4. Insulating washer
5. Motor housing
2
3
Figure 63
3. F1 terminal
4. A1 terminal
Electrical System
1
4