Mitsubishi Electric HR Series, Instruction Manual, Page: 22 / 34

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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-machine
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 out the bearing. For a motor to be lubricated with
grease, 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) Fig. 10 Removal with a bearing puller (2)
15. REASSEMBLY OF MOTOR AND INSTALLATION OF BEARINGS
(1) Reassembly of motor
When reassembling 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 key seat may
cause personal injury. After inserting, check that the coil is free from scratches, and reassemble
the motor.
Bolt
Puller bolt
Puller plate
Nut
Bearing
Housing cover
Split in two
Support plate
Press with a press-machine
Shielded ball
bearing
Support legs
View of Support plate
Fig. 8 Removal of bearings with a press
(Name-B750058-2)