11
QIS SERIES-M
03
OPERATION AND MAINTENANCE MANUAL
QIS SERIES
Centrifugal Pump
3. SPACING OF THE IMPELLER AND STUB SHAFT
The correct operation of the pump depends on the separation of the impeller from the backplate
and the fixation of the stub shaft on the motor shaft. Follow the next steps to fix the stub shaft on
the motor shaft:
3a
. Position the stub shaft collar (
13
) with the corresponding Allen screws (
14
) loosely on the stub
shaft (
10
) and place it on the motor shaft, it must slide in and out without problem. Figure
D
.
Figure
D
3b
. Place and fix the backplate (
7
) into the adapter using the four
hexagonal screws
(
22
) and
washers (
21
). The orientation of the backplate is with the flushing holes in a vertical position; the
flushes are used only for double mechanical seal. The backplate has a square shape in the back
to keep the mechanical seal static face in place. Figure
E
.
Figure
E
13
10
14
22
21
7
AS
S
E
MBL
Y
