n
16
Inspection
Interval
* Inspection
record should be
maintained.
Front casing
l
Stain in liquid-contacting
section.
l
Are there any cracks?
l
Wear or crack of front thrust
ring.
l
Expansion or wear of o-ring.
l
Scoring on inner surface.
¡
Clean.
¡
Replace if abnormality is
observed.
¡
Contact your distributor if
abnormality is observed.
¡
Replace if part is damaged.
¡
Contact your distributor if
abnormality is observed.
Spindle
l
Are there any cracks?
l
Wear on surface.
¡
Replace if abnormality is
observed.
¡
Replace if wear limit is
exceeded.
Part
Inspection Points
Operator Action
Every 3 months
n
Wear Limits of Spindle, Bearing, Mouth Ring & Impeller Thrust
If the difference between Bearing I.D. and Spindle O.D. exceeds 0.039 in. (1mm), either the bearing or the
spindle, whichever has the greater wear, should be replaced regardless of the values in the above table. In
case of a ceramic bearing type pump, the spindle and the bearing should be replaced simultaneously.
Initial wear may appear on the sliding parts during the first stages of operation. This should not be mistaken
for an abnormal condition.
Note: The spindle of all models can only be replaced with the rear casing since it cannot be detached. They
are an integral unit.
New
Replace
New Replace
Bearing I.D. inches (mm)
0.709 (18)
0.749 (19)
1.024 (26)
1.064 (27)
Spindle O.D. inches (mm)
0.709 (18)
0.670 (17)
1.024 (26)
0.985 (25)
Model MDH-(F)
400
401, 422, 423, 425
