FLENDER FLUDEX - Possible Causes; Unsuitable Coupling; Table 7-1 Table of Faults

Operation
7.2 Fault – causes and correction
M4602-02en Edition 09/2022 51
Fault Cause Rectification
No torque transmission The fusible safety plugs have respon-
ded to overheating or blocking and the
fluid is pouring out of the coupling.
Follow the instructions given in Section
Replacing the fusible safety plug
(Page53).
Presence of vibrations Coupling not suitable for the operating
conditions.
Check the possible causes given in
section Unsuitable coupling (Page51).
Use a coupling that is suitable for the
operating conditions.
Incorrect coupling assembly.
Check the possible causes given in
sections Assembly-related causes
(Page52) and Specific assembly-re-
lated and maintenance-related causes
(Page52).
Reassemble the coupling in compliance
with these instructions.
Please observe all the stipulations and
requirements given in chapter As-
sembly (Page27).
Incorrect maintenance of the coupling.
Check the possible causes given in
sections Maintenance-related causes
(Page52) and Specific assembly-re-
lated and maintenance-related causes
(Page52).
Please observe all the stipulations and
requirements given in chapter Mainten-
ance (Page55).
Table7-1: Table of faults
7.2.2.2 Possible causes7.2 Fault – causes and correction
7.2.2.2.1 Unsuitable coupling7.2 Fault – causes and correction
• Important information on the description of the drive unit and the environment were not
available when the coupling was chosen.
• System torque too high and/or torque dynamics not permissible.
• System speed too high.
• Chemically aggressive environment not taken into consideration.
• Coupling not suitable for the ambient temperature.
• Diameter and/or assigned fit of the finished bore not permissible.
• Width across corners of the parallel keyways greater than the width across corners of
the parallel keyways in accordance with DIN6885/1 for the maximum permissible bore.
• Shaft-hub connection incorrectly sized.
• Maximum permissible load conditions not taken into consideration.
• Maximum permissible overload conditions not taken into consideration.
• Dynamic load conditions not taken into consideration.
• Coupling and the machine and/or drive train form a critical torsional, axial or bending vi-
bration system.
• Components are mounted on the coupling which exert impermissible axial forces or
bending moments to the coupling.