Hypertherm MAX200 Machine Torch Plasma Arc Cutting System - Manual (Page 71)

4-6 MAX200 Instruction Manual
15
OPERATION
4. Using the 7/8" side of the wrench (supplied in the spare parts kit), remove the shield. Inspect the gas holes
from the inside. The holes should be clear of metal or other debris which will cause arcing. If the shield is still
good, screw it back on to the retaining cap and tighten it with the wrench. Replace ifdamaged.
5. Inspect the two O-rings on the torch. They should be lubricated and undamaged. If they are dry, lubricate them
lightly with a very thin film of the lubricant provided in the spare parts kit. If they are damaged, replace them.
6. Remove the nozzle with the 3/4" side of the wrench. Inspect it for damage or signs of wear. The inside of the
nozzle should be clean and bright, with no deposits from the electrode. You can clean the inside of the nozzle
with steel wool, but be sure to remove any remnants of the steel wool afterward. The hole in the nozzle should
not be worn or oval-shaped.
7. Remove the electrode with the center hole in the wrench and inspect it. An all copper electrode should be
replaced when the pit depth exceeds .040 inch (1 mm). A SilverPlus electrode should be replaced when the pit
depth exceeds approximately two times the recommended depth of an all copper electrode. If the electrode is
still good, inspect its O-ring – it should be lubricated and undamaged. If it is dry, lubricate it lightly with a very
thin film of lubricant provided in the spare parts kit. If it is damaged, replace it.
8. Remove the swirl ring from the electrode and inspect it. It should be clean, and the holes on the top and sides
should not be plugged. If the swirl ring is still good, inspect its O-ring. It should be lubricated and undamaged.
If it is dry, lubricate it lightly with a very thin film of lubricant provided in the spare parts kit. If it is damaged,
replace it.
9. Inspect the inside of the torch body by using a mirror, or by looking carefully inside. The inside of the torch
body should be clean and undamaged. Check for loose or damaged water tube. A loose or damaged tube can
cause:
• shortened electrode life
• the flow switch interlock to shut the system down
• humming or rattling sound to come from the torch
Use the water tube removal tool (027347) to loosen or replace the water tube.
When installing the water tube, do not overtighten! Snug down by hand only.
10. Replace the electrode and tighten it with the wrench. Do not overtighten.
11. Install the swirl ring with the bottom O-ring facing the inside of the torch – it won't fit in properly if it is installed
in the wrong direction. Push it into place. Hold the swirl ring in place until the nozzle is installed to avoid
dropping it into the water.
12. Install nozzle until finger-tight, then tighten with wrench. Do not overtighten.
13. Replace the retaining cap. Make sure that it is tightened snugly; if it is loose, it can affect the shield gas flow.