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14
. DISASSEMBLY OF MOTOR AND REMOVAL OF BEARINGS
(1) Disassembly of motor
When disassembling the motor, observe the following
instructions.
a. Put matchmarks on the parts so that the positions of
the installed parts can be checked on reassembly.
Particularly, when using the outdoor type motor,
check the gap between the flinger used for the shaft
through hole and bracket and the gap between the
water flinger and bracket. If the motor has a drain
hole, clearly indicate the position of the hole. When
the motor uses open bearings, check the positions
of the grease port in the bearing cover and the oil
supply and drain ports in the bracket.
b. When drawing out the rotor, take care not to damage
the coil end of stator.
(2) Removal of bearing
If the bearing is removed forcibly by hitting with a hammer or wrenching, the shaft may be bent. Remove it
sufficiently carefully using the special tool or a gear puller.
a. Removal with press
Hold the rotor with the bearing inner ring as shown in Fig. 8, and slowly press the shaft end to remove the
bearing.
b. Removal with bearing puller
When drawing out the bearing with a bearing puller as shown in Fig. 9, set the claws on the bearing inner ring
and turn the handle to draw it out. For the motor that requires grease lubrication, set the claws of the tool on
the housing cover as shown in Fig. 10, and draw out the bearing. Check for difference in length between the
right and left parts of the tool. If the bearing is drawn out in an inclined state, the shaft fitting surface may be
deformed.
Fig. 9 Removal with a bearing puller (1)
15
. REASSEMBLY OF MOTOR AND INSTALLATION OF BEARINGS
(1) Reassembly of motor
When disassembling the motor, observe the following instructions.
a. When creep-resistant bearings (with O-rings) are used
Before reassembling, apply grease (Alvania S2 or the like) between the two O-rings on the bearing outer ring.
b. When inserting the rotor into the stator
When inserting the rotor, take care not to damage the stator coil. Touching the keyway may cause personal
injury. After inserting, check that the coil is free from scratches, and reassemble the motor.
c. When installing the bracket
Apply a thin layer of grease (Alvania S2 or the like) to the bearing housing.
(Nagoya Works B750058-2)
– 17 –
Support plate
Split in two cover
View of support plate
Fig. 8 Removal of bearings with a press
Bolt
Housing cover
Bearing
Fig. 10 Removal with a bearing puller (2)
Press with a press
Shielded
ball bearing
Support
legs
Puller plate
Puller bolt
Nut
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