2200Q2JE-HO-KHM-N_2015.02.
Chapter 5 Maintenance and Inspection
Ammonia Semi-hermetic Motor with K-series Compressor 5.1 Precautions for Maintenance
5-11
Table 5-4 Mass of the Motor Rotor
5.3.8 Motor Rotor
a) Likewise the case of motor casing, prepare the
set-up to lift up the motor rotor [607] by using
a crane or chain block and hooking the lifting
tool.
b) Loosen the motor rotor mounting bolt [609] at the end of the motor rotor shaft (following picture to
the left). Keep the bolt loosed to an extent of about three turns.
c) Use a pulley extractor to take off the motor rotor from the compressor shaft [2]. Hook the claw of
the pulley extractor at the flange of the motor rotor bushing [608], with the tip of the extractor
jacking bolt in contact with the head of the motor mounting bolt (see the above picture to the right).
d) While screwing the jacking bolt of the pulley extractor, the joint of compressor shaft and motor rotor
bushing is disengaged. Since the compressor shaft is tapered, once the tapered section is
disengaged, the shaft can be readily withdrawn.
e) Take off the pulley extractor and try to lift up the motor
rotor liberated from the compressor shaft. Pull off the
motor rotor mounting bolt and pull the motor rotor toward
yourself to pull it off (picture to the right). The shaft is
attached with a key [4], which should be stored to
prevent from losing it.
f) At the end of the motor rotor bushing, the inner race of
motor bearing [613] is shrink fit (following picture). As
long as the bearing does not show any particular
abnormality, there is no need of removing it.
When replacing the bearing, remove the snap ring B [613-2]
that is fit in front for retaining the motor bearing, and heat up
the outer circumference of the inner bearing race with a gas
torch or the like to remove it.
Motor Model NHM30 NHM30 NHM30
Mass (kg) 60 80 120
● When pulling off the heated inner bearing race,
use a pair of thick leather gloves to prevent
your hand from a burn.
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