Maintenance; Disassembly Of Front End; General - ESAB PT-26 Manuel D'instruction

sEctIoN 5
5.1

Disassembly of front End

WarNINg
If the stand-off guide is being used, remove it by twisting clockwise and pulling it from the heat shield.
Unscrew the heat shield and remove it from the torch. The nozzle should remain in the torch head. Some cool-
ant leakage is normal as the shield is removed. Inspect the heat shield. There should be no signs of arcing any-
where inside the shield. The outer insulating jacket should not be severely worn or charred. Replace the shield
if any of the above mentioned damage is found.
Pull the nozzle from the torch head and inspect it. The orifice should be round at both the entrance and the
exit. Replace the nozzle if the orifice is oval shaped or damaged. The nozzle may have grey to black deposits
on the inside surfaces. They may be cleaned with steel wool but care must be taken to remove all traces of the
steel wool afterward.
Inspect the electrode. If it has a pit more than 1/16" (1.6 mm) deep at its center, replace it.
Inspect the electrode holder each time the electrode is replaced. There should be no signs of arcing and the o-
rings should not be worn or damaged.
Inspect the insulator. If any signs of arcing are found, replace it.
Inspect the torch head o-rings. If they are worn or damaged, replace them. They will last longer if they are kept
covered with a thin film of silicone lubricant (0558000443). Use just enough to make the o-ring appear wet or
shiny but do not leave clumps of excess lubricant.
After all of the front end parts have been inspected and replaced as needed, reassemble the torch as described
in the section 3.5 "Assembling Front End Parts".
5.2

general

Periodically check the heat shield, electrode holder assembly and insulator. If any of these parts are damaged or
excessively worn, replace them.
Check the torch o-rings daily. If any o-ring has nicks, cuts or other damage, replace it. If it is dry, lubricate it with a
thin film of lubricant. If no drag, caused by the o-ring, is felt when installing the heat shield, replace the o-ring.
The torch cable sleeving should be inspected periodically. If any damage to the sleeving is found, inspect the
torch power and pilot arc cables for damage. If gas leaks or damage of any kind are found, replace the compo-
nents in question.
MaKE surE poWEr sWItch oN poWEr sourcE Is IN thE off posI-
tIoN aND prIMarY INput poWEr Is DEENErgIzED.
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MaINtENaNcE