Are these cam type ATC or the old rack ones ? Sounds like you need to bleed the system. They use air over oil in MANUAL unclamp only if its the cam type. Cam type has a piston in the atc that pushes hydraulic oil to release the tool in MDI/auto. You should see a small black hex fitting sticking out next to the unclamp cyl. with a small tube and a set screw on the end. IN AUTO OR MDI only, crack the screw and watch for bubbles coming out of the tube. Close the fitting, go to manual, to a few manual unclamps, go back to mdi and do it again. You may have to do it a few times. Some machines have a pressure guage right above the ATC with a green area. You want to bleed it till it gets to that. If it keeps loosing bleed, you may need to change the lusifer valve on the front of the unclamp cyclinder. If those leak, it will force air in to the system during auto tool change. |