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These instructions have been specifically released for KRAL screw pumps that belong to K-series featuring magnetic coupling. They include technical data and functional description of the pumps - labeling and operating data, instructions for proper transportation, storage and preservation, disposal, installation, electrical connection, pump removal, operation issues - startup, pump shutdown, resuming pump operation, servicing/maintenance, replacement of the magnetic coupling, ball bearing and the set of screws, assistance with problems. There is set of drawings, including general drawings plus exploded views of screw pump with and without magnetic coupling and motor. Should be read and used by crew members engaged in the operation and routine maintenance of subject pumps as well as service engineers who may use this document as thorough and comprehensive reference book.