•
Check and clean the impeller bore diameter.
•
Check the impeller balance. Rebalance the impeller if it exceeds the ISO 1940 G2.5 criteria.
NOTICE:
You must have extremely accurate tooling equipment to balance impellers to the ISO 1940
G2.5 criteria. Do not attempt to balance impellers to this criteria unless this type of tooling and
equipment is available.
Impeller areas to inspect
101
Impeller
202 and 203 Impeller wear rings
Figure 52: Areas to inspect for wear on impeller
Venturi Insert Inspection ( Venturi casings only)
Inspect the insert for excessive wear or pitting. Inspect the notch and the through hole on the end of the
venturi insert. Ensure no foreign material is present. Clean thoroughly in order to remove any debris. Re-
place insert if there is any damage, wear, or pitting present to the notch, through hole, or gasket surfa-
ces.
100W
100W
100W
Venturi insert
Figure 53: Venturi insert inspection
Oil ring replacement
Oil rings must be as round as possible in order to function properly. Replace oil rings if they are worn,
distorted, or damaged beyond reasonable repair.
Cartridge mechanical seal replacement
Cartridge-type mechanical seals should be serviced by the seal manufacturer. Refer to the instructions
from the mechanical seal manufacturer for assistance.
6.5 Preassembly inspections
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