PT-36 Mechanized Plasmarc Cutting Torch Instruction Manual

section 5MaintenanceChecking for Coolant Leaks:Coolant leaks can originate from seals on the electrode, electrode holder, nozzle, and torch body. Leaks couldalso originate from a crack in the insulating material of the torch or nozzle retaining cup or from a power cable.To check for leaks from any source remove the shield cup, clean off the torch, purge it, and place it over a cleandry plate. With the gases off, run the watercooler for several minutes and watch for leaks. Turn on the plasma gasand watch for any mist from the nozzle exit. If there isn’t any, turn off the plasma gas, turn on the shield gas, andwatch for any mist from the shield gas passages in the nozzle retaining cup.If a leak appears to be coming from the nozzle orifice, remove and inspect the o-rings on the nozzle, electrode,and electrode holder. Check the sealing surfaces on the electrode holder and stainless steel torch liner.If you suspect that a leak is coming from the electrode itself, you can install a PT-19XL 100 to 200 amp 2-piecenozzle base without a nozzle tip. After purging, run the water cooler with the gas off and observe the end of theelectrode. If water is seen to collect there, make sure it is not running down the side of the electrode from a leakat an o-ring seal.WARNINGIf it is necessary to supply power to the power source to run the watercooler, it is possible to have high voltages at the torch with no arcpresent. Never touch the torch with the power source energized.168