Logically, the most important part of any Secoh pump installation is the installation itself.
So, if a pump is trying to pump with a blocked filter, or is in a container with insufficient ventilation, or (most likely) is trying to pump high volumes of low pressure air into a system which is partially (or entirely) blocked, the pump tries it very hardest (bless it) but it's going to have some problems.
It's not too common, but not entirely unknown in this scenario that the pump ends up working too hard and, by heating up, we've seen the resin holding the magnets in their carrier start to melt. The magnet can then start to become loosened in the carrier (see photo on the right) and (as the magnets are REALLY strong) they gradually pull themselves out of the carrier and they're (usually, but not always
We've also occasionally seen installations where the pipework the pump is blowing into has been accidentally bent or kinked, this (in a similar way to a blocked pipe) ends up with significant back pressure to the pump, the pump heats up, the diaphragms - now running at an elevated temperature - can distort and allow the magnet to move sideways. This then rubs on the sides, friction heats the whole thing up even more .. and that's that.
.. well .. if the magnet isn't too badly damaged, you have nothing to lose by cleaning it and trying to glue it back together with araldite : try this LINK to the Araldite website :
or another epoxy (2 part?) resin adhesive.
If that doesn't work, go for a replacement magnet. .. but track back the REASON for the failure .. so blow a compressor down the pipes to clear out that blockage, check for kinked pipework, check the filter is clean and that the pump container has sufficient ventilation - let's be honest, if the pump is (for example) blowing out 200 litres of air a minute, it needs at least
that amount of clean, fresh air available per minute too.
If you wish, pull the pump out of it's container and sit it nearby with a upturned wheelbarrow over it for a while before making a long term decision .. but whatever you do clear those pipes before re-installing the pump