160GR Natural Gas Booster Instruction Manual
Mayekawa all rights reserved. Subject to change without notice. Lat revised in October 2007
p.20
7. Disassembly
Preparation
Although screw compressors are reliable machines, they need to be disassembled to have
their parts inspected after operating for a certain amount of time. In this chapter, the
procedures and instructions for disassembly and parts inspection will be provided.
Disassembling a compressor at the installed site is limited to: the shaft seal parts, the
unloader parts, and the balance piston parts. When the compressor is to be entirely
disassembled, the compressor needs to be removed from the mounting and placed in a
proper environment for disassembly.
Before the disassembly procedures, parts inspections and their handling, study this manual
and the actual compressor and understand the structure very well.
Tools for Disassembly
For disassembly process, properly use recommended tools for disassembly. The
recommended tools include special tools that need to be ordered from Mycom / Mayekawa
MFG.
As general tools, a hammer, a monkey wrench, a filer, and a sand paper (#800 and above)
will be required.
Other than the tools, you will need oil to wash the oil, new refrigeration oil, an oil can, a can
for drained oil, and waste cloth, etc. Use a large platen for the process, and choose a dry,
large environment with the least amount of dust or sand.
Removing the Compressor
7.1
Interior Gas Recovery
When the screw compressor is at a stop, the inside pressure of the compressor is very
high. Equalize the pressure with the lower pressure side. Then recover the gas to
equalize the pressure as the air pressure or a bit lower than that.
7.2
Removing the connecting parts
Make sure that the inside pressure of the compressor is the same as or a bit lower than
the air pressure before starting to remove parts.
Remove the connecting parts to the compressor, the coupling, the suction pipe, the
discharge pipe, refueling pipe, and the fixing bolt in series.
*
When removing the refueling pipe (etc.), prepare a receiver for the residual oil that
overflows from the inside.
7.3
Suspending and Transferring the Compressor
The flange of the suction pipe is located on top of the compressor. Before suspending
the compressor, remove a part of it if the piping seems to interfere with the suspension.
Use the eyebolt on the bearing head and the two eyebolts on the suction cover to
suspend the compressor. When suspending, adjust the length with chain blocks etc. to
keep the compressor leveled.
In the preparation of disassembling the compressor entirely, have the compressor suspended
and remove the 4~6 hexagon socket head cap screws on the bottom of the casing which lock