First unscrew the nozzle, unscrew the nozzle, then unscrew the outer steel ring, take out the inner ceramic ring, and take out a new ceramic ring. The upper sealing ring is not necessary, and there is no sealing ring when it is installed normally. Then, if you install it, find the ceramic ring. The point on the ring, there is a slot where the ceramic ring is installed inside the cutting head. Find the corresponding position and replace the ceramic ring. Screw the outer steel ring. The steel ring should be screwed along the thread. If it can’t be screwed, it proves that the ceramic ring It has been stuck, and then the nozzle is replaced, so that the replacement of the ceramic ring is completed.
