2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor 5.4 Disassembly and Inspection
1612LSC Speed Increaser Type
5-16
Loosening Screws Fastened Seal Cover Seal Cover and Mating Ring
Loosening the Seal Collar Set Screw Seal Retainer
h) Pull out the seal collar part with your fingers. When pulling out, ensure that the tips of the set
screws do not hit the shaft. Axial direction damage to the shaft can cause leaks.
i) Screw two M8 eye bolts into the threaded holes in the oil seal retainer and pull out the oil seal
retainer while keeping it at a right angle against the shaft.
j) Remove the oil seal [50] that is attached into the oil seal retainer.
5.4.1.2 Inspection
a) Mechanical seal should be replaced if any defect is found during inspection. Actually, however, it is
sometimes difficult to find out defects on the sliding surface only through visual inspection. In such
circumstances, MAYEKAWA recommends to replace it with a new one in the same manner as with
O-rings or gaskets. In addition, if it is difficult to stop the compressor operation except for scheduled
inspections, we recommend to replace the mechanical seal assembly with a new one at every
inspection of this block.
b) Since swelling or deformation can occur easily on O-rings, replace them each time the mechanical
seals are inspected.
There are three seal O-rings: the O-ring [49] between the seal cover and seal retainer, the O-ring
[103] between the mating ring and seal cover, and the O-ring [112] between the seal collar and shaft.
For BOS models, there is another O-ring [106-2] on the main body of the mechanical seal, bringing
the total to four O-rings.
c) Oil seal is also unconditional replace. Use genuine replacement parts. Since the oil seal is made of
a special material, only a genuine oil seal must be used for replacement.
d) Replace the seal cover gasket with a new one.
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