Mazak tool change height

Any one know how to change the height for "z" when goes to changes tools? This for VNC 510c martix control.. guess i should have put that info in..

The Tool charger was has been making some larger then normal sounds... I can see where the tool charger is hitting the tool holders... I need move the head "z axis" down by about .04 ish.

I found out it M16 parameter but I have no such luck getting it to work

Thanks