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* Note on MDF-L 422, 423 and 425
The impeller is fixed to the magnet capsule by screwing. When removing the impeller from the magnet capsule,
hold the magnet capsule by hand and rotate the impeller counterclockwise (from the impeller side).
If thread part is too tight and the impeller is not disconnected from the magnet capsule, put the magnet capsule with
the impeller on hot water (about 90 ºC) for 5 minutes. And then rotate the impeller counterclockwise. Beware of
scald while this procedure.
Caution
When disassembling and reassembling MDF-L 422, 423 and 425 magnet capsule and impeller, pay attention
to followings.
• The O ring is inserted between the impeller and thread part of the magnet capsule. This O ring prevents
that the impeller comes loose from thread part of the magnet capsule, even if the pump rotates reverse
direction. When replacing the impeller and/or the magnet capsule, confirm the pump rotating direction is
correct before reassembling the impeller and the magnet capsule without O ring.
• If the impeller and the magnet capsule are reassembled with O ring, there is possibility that the impeller is
not screwed into thread part of the magnet capsule completely. This may cause pump damage.
[4] Remove the rear casing.
Insert a flat-head screwdriver into the perimeter of the rear casing and pull the rear casing forward while lifting it
slightly up.
* Pay extra attention not to scratch the sealing surface.
Do not hit them with a tool.
* Note on MDF-L250, 401, 422, 423 and 425
The spindle is integrated with the casing, not pressed
into the front casing.
*
During disassembly, discharge the liquid from the
casing and clean the inside of the pump.
[3] Pull out the impeller and magnet capsule
assembly toward yourself.
Be careful not to scratch the surface of each part.
Since the magnet capsule is strongly magnetized, store
it in a place free of metal pieces or metal powder.
Handle the front casing, magnet capsule, and impeller
with extra care so as not to scratch the sliding surface
and sealing surface.
* Note on MDF-L250, 401, 505, 507, 657, 6510 and
6515
Then disconnecting the impeller from the magnet
capsule, hold the magnet capsule by hand and strike
the rear of the impeller gently with a resin hammer.
When the impeller is tightly pressed in and
disconnection is difficult, warm the impeller and
magnet capsule in hot water (about 90 ˚C) for 5
minutes prior to striking the impeller with the hammer.
Impeller
Magnet capsule assembly
Rear casing
