What can cause the pins on the links of a multi-strain roller chain to rotate or protrude?

The rotation or protrusion of the pins on the links of a multi-strain roller chain is primarily influenced by misalignment. When the chain is not aligned correctly with the sprockets, it can create uneven wear and stress on certain areas of the chain. This misalignment can lead to increased friction and rotational forces that push the pins in ways they are not designed for, causing them to protrude or rotate from their intended position.

Maintaining proper alignment is crucial for the smooth operation of roller chains, as any deviation can cause disruptions in the chain's performance and even lead to premature failure. Therefore, ensuring that everything is aligned properly is essential for the longevity and efficiency of mechanical systems that utilize roller chains.