13
QIS SERIES-M
03
OPERATION AND MAINTENANCE MANUAL
QIS SERIES
Centrifugal Pump
3d
. Once the assembly is tightened place a shim of
0.025
”
(
0.63
mm) or
0.030
”
(
0.76
mm) between
the back of the impeller and the front of the backplate. You may use a caliper or some shims to
set the critical distance for the correct performance of the mechanical seal. Keep aligned both,
the stub shaft slot, and the collar slot before tightening the screw (or screws) on the shaft collar.
Compress the impeller against the backplate with the shim between them and proceed to tighten
the screw or screws on the shaft collar. Use the torque values for tightening the collar screws
indicated in the chart 2. Figure
H
.
Figure
H
Table 2 – Torque values for stub shaft collar Allen screws
Torque ft-lb
Models NEMA
Models IEC
13
Frame
56
to
18
Frame
80
to
112
30
Frame
21
to
25
Frame
132
to
160
35
Frame
28
to
32
Frame
180
to
225
Now turn the impeller by hand, it must turn without restriction. Check that every vane is separated
the distance indicated.
3e
. Using the
3/8
”
rod and the hexagonal socket and wrench to loosen the impeller nut to remove
the elements previously assembled.
0.025” (0.63 mm)
0.030” (0.76 mm)
Align stub shaft and
collar slots
AS
S
E
MBL
Y
