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SECTION VII
INSPECTION AND RENEWAL OF PARTS
7.1
General
Having dismantled the rotor, check the shaft for run out using "V" blocks or rollers placed under
the bearing areas. Run out of shaft is not to exceed .002" TIR (0.05mm TIR).
Wire brush the pump parts thoroughly. Clean off all scale, carbon, etc.
Examine parts for wear, corrosion and erosion.
7.2
Wear Rings (Impeller)
The impeller may be fitted with both front and rear wear rings or front ring only.
The impeller ring(s) are renewable and should be replaced when badly grooved, and/or when
pump performance does not meet the system requirements. Whenever it becomes necessary to
replace either wear ring, both rings involved (impeller and casing/casing cover) must be ordered
and replaced as a set as they are furnished standard size only (impeller ring oversize). Be sure to
re-establish the original running clearance between the two wear rings involved by machining the
fitted impeller ring.
To remove impeller wear rings, mutually remove wear ring set screws or ground off tack weld.
Rings can be machined off or grind two slots diametrically opposite across the width of the ring so
it can be split apart. Use caution if ring is removed by grinding so as not to damage impeller hubs.
IMPELLER
HAND
GRINDER
IMPELLER
RING
IMPELLER RING REMOVAL
