Hypertherm HT4100 Plasma Arc Cutting System Operating - Manual (Page 41)

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OPERATION
HT4100 Instruction Manual: Operation
Inspect the consumable parts before cutting for wear, and replaced when needed. Follow t
the instructions below to inspect and replace the consumables and refer to Figure 3-7.
Removal and Inspection
1. Unscrew the retaining cap.
2. Remove the nozzle from the torch using the 1-1/4" (32 mm) tool (004574) in the Spare
Parts Kit (028554). Check the orifices of the nozzle for signs of wear and arcing.
3. Remove the electrode by unscrewing it from the torch head using the 7/16" (11mm) socket
wrench (027001) supplied in the Spare Parts Kit. Inspect and replace the electrode if the
crater in the center of the insert exceeds .050 inch (1.3 mm).
4. Remove the swirl ring from the electrode and inspect it for plugged holes or other damage.
Replacement
Before replacing the consumable parts, clean the current ring in the torch. Use a clean paper
towel or cotton swab to remove any dirt, grease, etc., from the current ring. If the water tube
appears damaged or loose, see
Changing the Water Tube on page 3-15.
1. Replace the electrode by screwing it back into the torch head. Use the electrode socket
wrench to tighten down the electrode. Do not overtighten.
2. Prior to installing the swirl ring, apply a light coating of silicone grease to both outside
O-rings. As a guideline, you should be able to feel the grease on your fingers, but not see
it. Do not use an excessive amount of grease. The swirl ring ports can easily be
plugged by grease, causing improper gas flow during operation. When installing the swirl
ring, make sure to place the smaller diameter end into the torch.
3. When replacing the nozzle, apply a light coat of silicone grease to the O-ring on the O.D. of
the copper portion of the nozzle (as a guideline for amount of silicone, see step 2 above).
Insert the nozzle into the torch and tighten by hand. Use the nozzle wrench to tighten the
nozzle snugly. Do not overtighten.
CHANGING CONSUMABLE PARTS
WARNING
Always disconnect the power supply from the main power source before
inspecting or changing the torch parts.
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