2205B0JE-DA-J-N_2014.05.
5 Maintenance and Inspection
Screw Compressor J-series
5.1 Precautions for Maintenance and Inspection
5-1
5 Maintenance and Inspection
5.1
Precautions for Maintenance and Inspection
Before starting maintenance/inspection work after completely removing the refrigerant from the
package, make sure that the main motor, control and power for instruments and valves are
turned off and the power off switches are protected from any unauthorized access. In addition,
attach a tag to each power off switch informing other workers that the switch must not be turned
on. (Lockout/tagout)
Also when a manual valve is closed, apply appropriate measures so that it cannot be operated
by other workers and attach a tag stating that the device must not be opened.
Before disassembling, inspecting or handling the compressor, fully understand the
disassembly/assembly procedure of the compressor. This document does not provide the
complete procedures of compressor disassembly and assembly but just instructs the main
points in compressor service.
If you need to perform the complete compressor disassembly/assembly work, consult
in your region.
When replacing any parts with the compressor, always use the
genuine parts.
If any unauthentic part is used, unexpected problems may occur.
Do not modify the compressor or any of its parts without prior permission of Mayekawa. It may
cause the compressor to be damaged or disabled from maintaining its normal functions.
To disassemble the compressor, it must be removed from the package and placed on a work
bench. Before removing the compressor from the package, make sure to remove the
refrigerant in the package and confirm that the pressure inside the compressor is atmospheric.
Prior to removing the compressor from the package, check that the high temperature side
(discharge side) is cooled down to 40°C or less.
Perform the compressor disassembly on a rigid and flat work bench.
When removing the compressor from the package and placing it on the work bench, follow the
instructions in Chapter 3, "3.1 Precautions for Installation" and "3.2.3 Transfer".
Lifting and carrying works for the compressor and package must be performed by a qualified
person.
For compressor disassembly/assembly, use specified tools that are properly functioning.
When handling heavy parts, exercise extreme caution and use safe auxiliary tools such as
safety bolts.
When carrying a heavy part, use lifting equipment such as crane, or work with one or more
workers.
Before working with other workers, make sure that all workers clearly understand the work
procedure.
When turning on and off the power supplies, take care to avoid any electric shock hazard.
Any electric works requiring some expert qualifications must be performed by a qualified
person.
