rmgreen
Elite Cafe Member
I hooked up and operated for the first time a 850 rotary hand piece. This work with amazing ease and speed as to removal of background material. Previous to hooking up the 850 I was using a 901 AT with no problems. However, when I switched back over to the 901AT I could not get the 901 tuned. I get the vibration at low psi and as the psi is raised I get the hammering. I can not get the 901AT to stop hammering no matter what the air pressure setting is. I spent all Friday afternoon with tech at GRS and still the problem persist. It does not matter if the 901 is hooked up to AT position 1 or 2 both do not work. If I switch to foot control the 901 works perfectly. I have looked for pinched/holes in air supply lines inside and out and nothing found. I was hoping some one here might have a solution to this problem. Roger