● Coupling parts interchanged and hence not assigned to the specified shaft.
● Stipulated locking elements to prevent axial movements not installed.
● Stipulated tightening torques not adhered to.
● Bolts inserted dry or greased.
● Flange surfaces of screwed connections not cleaned.
● Alignment and/or shaft misalignment values not set in accordance with the instructions.
● Coupled machines were not correctly connected to the foundation so that a shifting of the
machines leads to an impermissible displacement of the coupling parts.
● Coupled machines not earthed adequately.
● Coupling guard used is not suitable.
Maintenance-related causes
● Stipulated maintenance intervals not adhered to.
● Spare parts that were used were not original spare parts from Flender.
● Flender spare parts that were used were old or damaged.
● Leak in the area of the coupling not detected so that chemically aggressive substances
damage the coupling.
● Indications of faults, such as noise or vibration, were not heeded.
● Stipulated tightening torques not adhered to.
● Alignment and/or shaft misalignment values not set in accordance with the instructions.
Specific installation-related and maintenance-related causes
● Flexible elements (12) not fitted.
● Fitted flexible elements (12) heated up excessively when applying heat to the coupling parts.
● Flexible elements (12) are of different types or age.
● Flexible elements (12) not replaced as sets.
7.2.3 Correcting faults
7.2.3.1 Replacing wearing parts
Flexible elements (12) are subject to wear and this wear can result in torsional backlash.
Operation
7.2 Faults - causes and rectification
N-EUPEX / N-EUPEX DS 3100en
40 Operating Instructions 10/2017
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