Mitsubishi Electric JR Series Instruction Manual page 23

c. When installing the bracket
Apply a thin layer of grease (Alvania S2 or the like) to the bearing housing.
d. Outdoor type motor
(a) Before reassembling, apply a sealing agent (ThreeBond 1102D or the like) to the frame fitting
surface of the bracket.
(b) When the flinger, water flinger and V-ring will be fitted to the shaft through hole, apply a thin
layer of grease (Alvania S2 or the like) to the bracket surface. Take care not to stain the shaft
with grease or oil. The mounting dimensions of the flinger and water flinger shall be identical
with those before disassembly. (Normally, the gap between the flinger and bracket shall be 0.3
to 0.5 mm, and that between the water flinger and bracket shall be 1 to 1.5 mm.) Bring the
V-ring into slight contact with the bracket. After fitting them, turn the shaft by hand, and check
for abnormal noise and non-smooth rotation.
e. When open bearings are used
When installing the housing cover and bracket, check the grease port in the housing cover and
the oil supply and drain ports in the bracket, and ensure that they are located in the same
positions as before disassembly.
f. Totally-enclosed fan-cooled motor
When installing the fan, apply grease (Alvania S2 or the like) to the shaft mounting surface. (So,
the fan can be removed easily next time.) Apply a screw locking agent (ThreeBond 1401B or
the like) to the setscrews of the fan before tightening.
g. Tightening of screws
Tighten the screws to the tightening torques shown in Table 15.
To install the frame bracket of motor of frame size 132 or below, fit the clamping bolts (through
bolts) perpendicularly to the fitting surface.
Screw size
Torque (N・m)
(Note) Except tapping screws
(2) Installation of bearings
When assembling the bearings onto the shaft, clean the fitting section of the bearings, remove any
scratches and protrusions, and hen fit with the following method.
a. Installation of a shielded ball bearing
(a) Apply oil on the bore diameter of the bearing and the fitting face of the shaft, and press the
bearing squarely onto the shaft by placing a suitable piece of pipe against the inner ring and
carefully pressing with a press as shown in Fig. 11. If a press is not available, tap the bearing
lightly and slowly lower it as shown in Fig. 12. In this case, take not to pry the bearing or to
contact the pipe against the bearing retainer seal or outer ring section.
(b) When heating the bearing with a heater or oven before insertion, heat the bearing to approx.
90°C (take care not to exceed 100°C), and then fit it onto the shaft. When mounting onto the
shaft, always wear protective equipment to prevent burns, etc.
(c) After fitting the bearing onto the shaft, check visually and with a thickness gauge that there is
no gap between the shaft and bearing.
(d) If the lock nut is tightened or the bearing is mounted on the bracket before the bearing cools
down, the bearing may be wrenched. Reassemble after the bearing sufficiently cools down.
Pipe
Bearing
(Name-B750058-3)
Fig. 11 Installation of the bearing
With a press
Table 15 Screw tightening torque standard (iron)
M4 M5
1.65 3.2
- 18 -
M6 M8 M10
5.5 13.2 26.5
Fig. 12 Installation of the bearing
with a hammer
M12 M16
46 110
Pipe
Bearing
(Name-B750058-1)