* 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. This should not be mistaken for an
abnormal condition.
M
Wear limit of mouth ring
M
Wear limits of bearing and spindle
Unit: mm
- 37 -
Model
Part
Inner diameter
of bearing
Outer diameter
of spindle
MDF-L
250
Upon
Ship-
ment
18
18
Upon
Replace-
ment
19
17
MDF-L
401, 422
423, 425
Upon
Ship-
ment
26
26
Upon
Replace-
ment
27
25
MDF-L
505
Upon
Ship-
ment
28
28
Upon
Replace-
ment
29
27
MDF-L
507, 657, 6510
Upon
Ship-ment
36
36
Upon
Replace-ment
37
35
MDF-L
6515
Upon
Ship-
ment
34
34
Upon
Replace-
ment
35
33
Upon Shipment
2 mm
Mouth ring
Impeller
MDF-L505, 507, 657,
6510, 6515
9
7
Model
Thickness upon shipment
Thickness upon replacement
MDF-L250, 401, 422,
423, 425
8
6
* The step between the surfaces of the mouth ring and the impeller upon shipment 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.
Unit: mm
