Don, the "Y" can be tricky, the fibres go this way and that in there, and if you just use brute force you will for sure tear some.
When pounding, use 2 very smooth surfaces. I use the butt end of a steel wedge supported in a vice, and a hammer. Just keep pounding and pulling right up to the "Y" intersection. You will keep stalling out there, but keep pounding and separating on all 3 parts, and eventually the "Y" intersection will become loose and it all comes apart. No pliers needed.