Assembly
5.3 Aligning the coupling
38 Edition 09/2022 M4602-02en
13.When flanging, take care not to damage the O-rings (117, 138) and the sealing surfaces.
The flange point can be joined using the screws (139). Ensure that the flange surface is
in perfect contact.
See Chapter “Tightening torques and widths A/F” (Page80) for screw tightening
torques.
14.Replace the flexible elements (12) removed from coupling part 1 (1).
Ensure that the flexible elements (12) have the same size and labelling.
The coupling parts may only have a maximum temperature of +80°C.
5.3 Aligning the coupling5.3 Aligning the coupling
5.3.1 Purpose of alignment5.3 Aligning the coupling
The shafts that are joined by the coupling are never on an ideal precise axis but have a cer-
tain amount of misalignment.
Misalignment in the coupling leads to restoring forces that can stress adjacent machine parts
(e.g. the bearings) to an unacceptable extent.
The misalignment values in operation result from the following:
• Misalignment due to assembly
Incorrect position due to a lack of precision when aligning
• Misalignment due to operation
Example: Load-related deformation, thermal expansion
You can minimise misalignment by aligning after assembly. A lower misalignment in the
coupling has the following advantages:
• Reduced wear of the elastomer components
• Reduced restoring forces
• Misalignment reserves for operation of the coupling
You can find the maximum permitted shaft misalignment values during operation in Chapter
Shaft misalignment values during operation (Page79).
Consult with Flender if the FLUDEX coupling is bolted to components which introduce axial
forces or bending moments into the coupling.
With type FNO (without add-on coupling), there is no need for alignment or it depends on the
components supplied by the customer.
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