Mouth ring
- 23 -
* If the difference between the inner diameter of the bearing and the outer diameter of the spindle exceeds 1 mm, either
the bearing or the spindle whichever has the greater wear, should be replaced regardless of the values in the above
table. In the case of a ceramic bearing type pump, the spindle and the bearing should be replaced simultaneously.
* Initial wear may appear in the sliding parts in the first stages of operation but this not abnormal.
Wear limit of mouth ring
Unit: mm
Wear limits of bearing and spindle
Unit: mm
* The step between the surfaces of the mouth ring and the impeller when shipped is 2 mm. The wear limit of the
mouth ring is reached when this step is reduced to 0 mm. Replace the mouth ring then
Model
Part
MDF-L
250
MDF-L
401, 422, 423, 425
When shipped
Time to be replaced
When shipped
Time to be replaced
Inner diameter of
bearing
18
19
26
27
Outer diameter of
spindle
18
17
26
25
Model
MDF-L250, 401, 422,
423, 425
Thickness when shipped
8
Thickness to be replaced
6
When shipped 2 mm
Impeller
