2200Q2JE-HO-KHM-N_2015.02.
Chapter 5 Maintenance and Inspection
Ammonia Semi-hermetic Motor with K-series Compressor 5.1 Precautions for Maintenance
5-6
5.3.3 Motor Jacket Cover
The overhaul of motor jacket cover involves the overhauling items described in Section 5.3.1.1 and
5.3.1.2. When performing the work described in Section 5.3.1.1 (inspection and cleaning the inside of
jacket) alone, remove the two jacket hoses for motor cooling and two tubes (
Φ8 mm) for motor bearing
feed/return oil, but there is no need of overhauling other components of the motor.
The motor jacket cover is a heavy component. The removal work must be performed
using lifting devices such as a crane, chain block, etc.
a) Prepare the set-up to lift up the jacket cover [610] by using a crane or chain block and the eye bolts
(hanging bolts) provided at two spots on top of the jacket cover.
Table 5-2 Mass of the Motor Jacket Cover
Motor Model Name NHM30 NHM30 NHM30
Mass (kg) 52 68 80
b) Before starting the work, close the valve at the inlet and outlet of compressor water cooling system
and drain the cooling water remaining in the compressor.
c) Remove the bolts of the hose elbow flange located in the upper area of the motor jacket cover, and
take off the flange from the jacket cover (following picture to the left).
d) Remove the cooling water drain plug (hexagon socket plug) at the bottom of the jacket cover, and
drain the cooling water in the jacket (following picture to the right).
e) Remove the two pipes (
Φ8 mm) between the motor spacer [600] and motor end cover [620].
The pipes can be taken off by removing the nuts for fixing the coupling of each pipe (following
picture).
f) Loosen and remove the fastening bolts [612], and take off the motor jacket cover.
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