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Maintenance
■ Wear limits of bearing and spindle
Check wear degree of the bearing and spindle.
Model
MX-F250/-F251/-F400/-F401
MX-F402/-F403
Before use
Wear limit
Before use
Wear limit
Bearing inner diameter
18
19
24
25
Spindle outer diameter
18
17
24
23
1. Above values show wear limit of the bearing and spindle.
2. If the clearance between the bearing and the spindle exceeds 1 mm, either of them, whichever has greater wear,
should be replaced regardless of the wear limit. For SiC/SiC (KK) type, replace the bearing and spindle at the same
time.
3. Sliding parts may suffer initial wear in an initial operation phase but this is not abnormal.
■ Wear limit of mouth ring
Check wear degree of the mouth ring.
NOTE: The mouth ring is 2 mm (3m for F250 and F251
types) forward from the impeller when shipped.
Before the step has reduced to 0 mm, replace the
impeller unit.
3. Spare & Wear parts
Appropriate spare parts are necessary for a long period of continuous operation. We recommend that wear parts
be always in stock. Place an order for spares with the following information.
1. Part names and part number (See the diagram below.)
2. Pump model identification code and manufacturing number (See pump nameplate.)
3. Drawing number if you have our approval drawing
Max
2mm
Impeller
Mouth ring
Model
Mouth ring thickness
Initial thickness
Wear limit
MX-F250/-F251/-F400/-
F401/-F402/-F403
8mm
6mm
