[waterjetmen]

Hi,

am working on a old 2006 omax 55100 and my dual on/off valve near the maxjet5 only last 2000-5000 cycles before I see a leak of water in my nozzle and abrasive tube.

Am at my 4 rebuilds kit (omax part*) and idk if because something keep hit my stem when my waterjet cup ? but I always do all my rebuilds in a clean space.

Any idea what can make my stem and my seat get damage ?

*I link some picture of my stem damage*