Bearing Head; Disassembly; Inspection; Rotors - mycom i125S Instruction Manual

5.4.6

Bearing Head

Though the case dividing method differs between i125* and i160*,
the work flow is the same.

5.4.6.1 Disassembly

a) Attach lifting tools, remove all bolts [2-1] that hold the part to the
main rotor casing, and separate the part from the main rotor
casing. If bearing head gasket [12] is stuck, use a jack bolt to
remove it.
b) Remove bearing head [11] while taking care not to let it be hit and
damaged by the rotor shaft. Also take care not to let the rotor fall
off the main rotor casing.

5.4.6.2 Inspection

a) If the alignment pin is bent or worn, replace it with a new one.
b) The bearing head gasket must be replaced with a new one.
5.4.7

Rotors

Rotors [25] [26] are heavy, precisely machined components,
which are the heart of the compressor.
Care must be taken not to get them damaged by dropping or in
other ways. Using damaged rotors may lead to deterioration in
performance or damage to the compressor.
5.4.7.1 Disassembly
a) When using the i125*, remove snap ring [29-3] from the F
rotor.
b) As it is heavy in weight, be careful when handling. As the
i160* rotor weighs more than 30 kg, use lifting tools such as chain blocks and nylon belts. Pull out
about two thirds of the rotor, attach a belt around its outer circumference, and then pull out the
remaining part of the rotor.
c) After pulling out the rotor, place it on V-blocks or the like to prevent damage to the outer
circumference.
d) Remove slotted set screw [31].
5.4.7.2 Inspection
Check that the rotor is not extremely worn or
damaged. Rotors stay almost free from wear
during normal operation. If the rotor is found
worn, check the cause and review the operating
state to prevent recurrence of the problem.
If the part wears beyond the replacement standard shown in Table 5-10, performance will be
deteriorated. Replacement of the rotor is recommended.
Screw Compressor i-series
Chapter 5 Maintenance and Inspection
Photo 013 Attach Lifting Tool
Photo 014 Pulling Out the Rotor
Table 5-10 Rotor Replacement Standards
measurement point
Rotor's outer diameter (mm)
5.4 Disassembly and Inspection
5-17
2203M4JE-MY-iS2-N_2017.04.
i125* i160*
127.475 163.175