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6. Check the impeller vanes for material trapped inside. If any of the five flow paths become
clogged, a hydrodynamic imbalance may cause excessive wear to the mouth ring and main bushing.
7. Check the inner magnet encapsulation for cracks or grooves in excess of 1/32" [0.8mm]. Fluid
inside the magnet area may cause swelling which could wear on the containment shell.
8. Check impeller and inner drive lugs for looseness or swelling due to plastic deformation. If
necessary, removal of the bushing and separation of the impeller and inner drive are required to
further inspect the impeller snap fit tabs and contact surfaces of the drive lugs. Replace the impeller
if the snap fit tabs or drive lugs are visibly cracked or deformed. Replace the inner drive if the drive
lug contact surfaces are swollen or deformed. Note: See Parts Replacement Procedures for
additional instruction and tooling.
9. Check for slurry. If the pumped liquid contains slurry, it may build up near the back of the main
bushing . This build-up may cause clogging of the journal bearing area of the main bushing and
create a dry-run condition. Estimate the rate of build-up from the first inspection and schedule the
unit for future maintenance accordingly.
10. Inspect the containment shell for signs of abrasion. Replace if scratches or grooves in the inner
surface are deeper than 1/32" [0.8mm]. Also replace if the outside has grooves deeper than 0.020
[0.5mm] inches. Inspect the back thrust ring for chips or cracks.
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