23. Repeat the alignment until the values are within
the tolerances. Go to step 14.
TM038320
24. Check the gap S2.
TM038325
See the table Air-gap width S2.
Related information
4.5.4 Tightening torques
4.5.5 Pin coupling air-gap width S2
4.5.4
Tightening torques
Refer to this tightening torques table when align the
motor and pump.
Description Dimensions
Tightening
torque [Nm]
Hexagon head
screw
M4 3 ± 10 %
M6 9 ± 10 %
M8 21 ± 10 %
M10 41 ± 10 %
M12 72 ± 10 %
M14 114 ± 10 %
M16 177 ± 10 %
M18 244 ± 10 %
M20 345 ± 10 %
M22 470 ± 10 %
M24 597 ± 10 %
4.5.5 Pin coupling air-gap width S2
Measure S2 all the way around the
coupling. The maximum permissible
deviation between the largest and the
smallest measurement is 0.1 mm.
After the installation is finished, tighten the
screws connecting the flange, feet and the
anchor bolts according to the tightening
torques. Anti-loose method should be
applied.
Outside coupling
diameter [mm]
Air-gap width S2 [mm]
Standard coupling
Nominal Tolerance
90-213 3.2 mm 0/-1
251-270 4.8 mm 0/-1
306-757 6.4 mm 0/-1
If the coupling and motor are not supplied by
Grundfos, make sure to follow the coupling
manufacturer’s instructions.
WARNING
Crushing of hands
Death or serious personal injury
‐ To protect persons from rotating
machine parts, always install all guards
after the installation is complete and
before starting the pump.
29
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