M
Wear limits of tips of impeller thrust and spindle
(only for pumps with D or E at the end of model identification)
Pumps whose model identification codes have D or E at the end are designed to result in contact between the impeller
thrust tip and the spindle tip in the event of an abnormal operating condition (cavitation, dry operation, etc.). If the tips
are worn out beyond the wear limit level, the pump is subject to serious damage. The condition of the tips in contact
must be checked if an abnormal profile such as dry operation or cavitation lasts a total of over 3 hours.
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Wear checking steps
[1] Remove the rear casing from the foot support
and insert the magnet capsule attached to
impeller can into the rear casing.
[2] Rotate the impeller slowly by hand, with it
positioned on the rear casing.
• Tips are not worn out beyond wear limit
The impeller and magnet capsule will continue
to rotate smoothly.
• Tips are worn out beyond wear limit
The impeller and magnet capsule will not
continue to rotate smoothly. The contact at the
A section or B section, as shown in the figure of
the left, does not allow for the continuous
smooth rotation of the impeller and the magnet
capsule because the tips of the two elements are
excessively worn. In this case, replace the
impeller and rear casing with new ones.
Foot support
Rear casing
Impeller
Impeller thrust
A section
B section
Spindle
Rear casing
Magnet capsule
