19
Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
7. GENERAL ASSEMBLY INSPECTION
Before inspecting your pump’s assembly,
double-check that the electric supply is
disconnected, and that there is no supply
of pressure or fluid into the piping.
WARNING
Before continuing please check that all bolts/screws and set screws have been tightened.
Rotate the stub shaft by hand, using the impeller. The stub shaft should rotate easily. If something
is interfering with its rotation, inspect all parts to verify correct assembly (stub shaft, seal,
backplate, etc).
8. IMPELLER RETENTION
IMPELLER RETENTION ON STANDARD STUB SHAFTS.
Find the following parts: impeller
(
2
), retainer (
24
) and standard stub shaft (
6E
).
Place the retainer into the drilled hole atop the stub shaft so that it is completely receded.
When you have placed the impeller at the back, make sure that the retainer falls to lock in the
impeller.
Figure N.
IMPELLER RETENTION ON STUB SHAFTS PLUS.
Find the following parts: impeller plus
(
2P
), impeller gaskets (
back, 91A
) and (
front, 91B
), impeller nut (
24D
), shaft key (
24C
) and stub
shaft plus (
6P
).
Place the shaft key into the stub shaft and place the back impeller gasket (
91A
) into the groove
on the shaft. Slide the impeller onto the shaft until it reaches the back and place the front gasket
(
91B
) onto the impeller nut, screwing the nut (
24D
) onto the impeller. Make sure the gaskets stay
in place.
Figure P.
Figure O
Standard stub shafts
and impeller pin
Figure P
Stub shaft plus
and impeller nut
ASSEMBL
Y
