One of our customer asked for solution: they have problem with TLJ 350 extrusion machine pump motor. It remains continually running and no cut off, but the pressure drops from25.4mpa to 22mpa in 16 seconds when it runs without load.
Our suggestion is: 1. there maybe pressure leakage somewhere, otherwise the pressure can not drop so fast; 2. pressure sensor goes wrong
Finally, our customer find the problem, the O ring of pump broken so there is pressure leakage.
Although we are just extrusion parts supplier not extrusion machine equipment manufacturer, we have many customers running the machine and we have lots of experience. We would like to try our best to help our customer to solve any technical problem. Thanks for your trust and will not let you down!
http://www.dubetterinc.com 
http://www.chinacornerbead.com