2200Q2JE-HO-KHM-N_2015.02.
Chapter 5 Maintenance and Inspection
Ammonia Semi-hermetic Motor with K-series Compressor 5.1 Precautions for Maintenance
5-10
5.3.7 Motor Casing
The motor casing and the motor rotor described on the next page are heavy items.
To remove them, be sure to use a crane or other lifting device.
a) Prepare the set-up to lift up the motor casing by using a crane or chain block and hooking the lifting
tool. The motor casing [603] can be lift up by using the eye bolts (hanging bolts) on top of the outer
circumference of it on the compressor side and screwing in an M12 size eye bolt (hanging bolt)
into the single threaded hole on top of the motor jacket cover so as to hook the chain slings
(following picture to the left) or by using a belt sling around the body of motor casing (picture in the
middle below).
Motor Model NHM30 NHM30 NHM30
Mass (kg) 250 300 340
.
b) Loosen the two bolts fixing the leg parts of the motor casing to the base frame, and take them off.
c) The motor casing is mounted on the motor spacer [600] by using 12 bolts [605]. Remove the bolts
and take the casing off by pulling it toward yourself. First remove the two fastening bolts for the
motor casing and screw in the stud bolts (picture at middle above). These bolts can be used as
guides in the initial stage of pulling out.
d) Remove the remaining bolts for tightening the motor casing, while slightly lifting up the motor
casing.
e) Mount the jacking bolts in the threaded hole on the left and right side of the motor spacer and
screw in them equally on the left and right to peel off the gasket and take off the motor casing from
the spigot section of the motor spacer (picture at right above).
f) Then, slightly lift up the motor casing while
preventing the interference with the motor rotor
[607], and gradually pull the motor casing toward
yourself. Continue the extracting work while
visually checking so that the motor rotor will come
to the center of the motor stator. Complete the
extracting work while exercising sufficient care not
to damage the winding of the motor stator with the
fins of the motor rotor in the course of pulling out.
Motor Rotor Fin and Stator Winding
Table 5-3 Mass of the Motor Casing
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