ESAB PCM-875A Installation, Operation And Maintenance Manual page 81

SECTION 5
PCM-875A Plasmarc Cutting System
1,5 mm
3. Remove the nozzle and electrode assembly
from the shield and inspect for wear. The nozzle
orifice should be round at both the entrance and
the exit. If the nozzle orifice is worn in an oval
shape or shows other signs of damage at either
end, it should be replaced. The inside of the nozzle
may have light gray deposits from the electrode.
These may be removed with steel wool but care
must be taken to remove all traces of the steel
wool afterward.
If the electrode has a pit that is more than 1.5mm
deep at its center, replace it. Grasp the electrode
holder with the fingers using the two flats and
grasp the electrode between the thumb and finger
of the other hand and twist.
Inspect electrode insulator and electrode holder
assembly for signs of damage such as arc tracking
or cracking and replace them if any are found.
Insure that the baffle tube is securely threaded into
the electrode holder, but do not over tighten. Use
the small hex end of the plastic wrench in the
spare parts kit.
After installing the electrode insulator onto the
electrode holder assembly, install electrode by
reversing the procedure used to remove it. Note
that firm tightening of the electrode by hand is
sufficient. The use of tools such as wrenches or
pliers is not required or recommended.
4. Inspect heat shield for signs of damage or
wear. The gas holes inside shield should not be
blocked by debris, and there should be no signs of
arcing anywhere inside the shield. The outer
insulating jacket of the shield should not be
severely charred or eroded. Replace the heat
shield if any of the above damage is found.
.
Maintenance
5-9