Sumitomo QT Series - Page 9

HMP-0567E Rev.7 (9/19)
b) It is recommended to machine the coupling hole such that the respective dimensions shown
in Table-3.3.1 are within the corresponding tolerances stated in the same table.
c) Do not strike the coupling with a hammer or similar tool in order to attach the coupling to the
pump shaft.
d) Before performing alignment, attach a dial gauge to the coupling, as shown in Figure-3.3.1.
Perform alignment by rotating the coupling.
: ENSURE THAT THE MISALIGNMENT BETWEEN THE SHAFTS IS 0.05 MM OR
LESS AND THAT THE ANGULAR DIFFERENCE BETWEEN THEM IS 1° OR LESS.
e) Certain operations, such as attaching a pipe or transporting/installing the unit, may cause
the misalignment to increase. After performing such operations, be sure to recheck the
misalignment.
Figure-3.3.1: Tolerance of Misalignment
Table-3.3.1: Recommended Coupling Dimensions
Pump
size
Hole dimension
Keyway dimension
Main dimensions of
coupling hole
A (Diameter)
(mm)
Tolerance
(μm)
B
(mm)
Tolerance
(μm)
C (mm)
Tolerance
(μm)
2
20
+ 28
+ 9
6
+ 40
+ 10
22.6
+ 100
0
3
25
+ 28
+ 9
8
+ 46
+ 10
28.3
+ 200
0
4
32
+ 34
+ 11
10
+ 46
+ 10
35.2
+ 200
0
5
40
+ 34
+ 11
12
+ 53
+ 10
43.2
+ 200
0
6
50
+ 40
+ 11
14
+ 53
+ 10
53.7
+ 200
0
4) Suction pressure
Ensure that suction pressure does not exceed the tolerable pressure for the shaft seal, shown in
Table-3.1.1.
Dial indicator
Allowable radial
difference = 0.05 mm max.
360° Part
Rotation
Allowable angular
difference = 1° max.