Water remains in the coupling for a long time, accelerating the jamming of the coupling. When the jamming phenomenon and severe rust occur, the main oil pump rotor, turbine rotor, and coupling will bite together, and at this point, the coupling has been scrapped. There are many reasons that can cause tooth loss, mostly due to uneven force on the teeth of the coupling, such as deviation in tooth shape during machining or local entry of hard objects into the teeth during operation, resulting in individual teeth being subjected to force;

Deviations during installation can also cause local teeth to be under stress. Another reason for tooth loss is improper heat treatment during coupling processing, which can result in residual stress or even cracks inside the teeth. The direction of the coupling bolt is a crucial link, and it is important to remember not to install or discard any small parts, including spring washers, in order to fully utilize the performance of the bolt assembly.

When the coupling is running at high speed, frequent idling and half idling can affect its service life, the size and nature of the torque required to be transmitted, and the requirements for buffering and vibration reduction functions. The front end of the bolt and the axis may directly cause damage to the axis or difficulty in folding, and the elastic effect can compensate for angular deviation. The two protruding teeth closely mesh and bear radial compression to transmit torque.

Couplings have the ability to compensate for the relative displacement of two axes, and many couplings have good performance in use; The working speed of the coupling and the magnitude of the centrifugal force caused by it, as well as the magnitude and direction of the relative displacement between the two shafts, make it difficult to maintain strict alignment between the two shafts after installation and adjustment. The performance and working environment of couplings are usually made of metal components that do not require lubrication and are easily affected by the degree of lubrication.