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Photo 002 Removing Seal Cover Photo 003 Seal Cover and Mating Ring
f) After removing the seal cover, wipe clean and inspect the shaft surface. If there are scratches, use
fine sandpaper to smooth them over. This is done to prevent damage to the internal O-ring when
pulling out the mechanical seal.
g) Loosen the set screws [111] of the seal collar [109] by turning them approximately three times
(Photo 004). Do not remove the set screws completely, but leave them so that their ends are below
the surface of the seal collar. These screws are located in two places 90 degrees apart from each
other.
h) Pull out the seal collar with your fingers. While pulling out, make sure that the ends of the set screws
do not touch the shaft surface. Axial-direction scratches on the shaft can cause leaks.
i) Screw two M8 eye bolts into the jacking threaded holes. Then pull out the seal retainer while
maintaining a right angle to the rotor shaft.
j) Remove the mating ring from the seal cover. At this time, be careful not to damage the mating ring.
5.4.1.2 Inspection
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.
The contact between the sliding surfaces of the mating ring and seal collar must be checked even when
replacing the seal. If there are obvious traces of uneven contact or damage, find out the cause
(degradation over time, problems such as heating operation, etc.) and take necessary actions.
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