The main cause of coupling failure is selecting the incorrect type of pump couplings for your equipment. This isn’t a one-size-fits-all type of product, so be sure to consult with an engineer or equipment technician to ensure that you’re using the correct type of pump coupling. Coupling failure, in this case, may derive from: lack of lubrication (or excess thereof), excessive misalignments, and unsuitable operating conditions. Couplings also fail whilst undergoing excessive speeds or when bearing too great a load for what the equipment and/or couplings were designed for.