Dirt Or Contamination; Removal And Replacement Of The Torch Head - ESAB PT-26 Manuel D'instruction

sEctIoN 5
5.3

Dirt or contamination

Dirt or other contamination can cause premature failure of the PT-26 torch through internal arcing. To avoid this,
users are instructed to do the following:
1. Insure that clean, dry, oil-free air is used for plasma and/or shield gas.
2. Avoid excessive use of the silicone o-ring grease on the torch o-rings. A thin film is sufficient.
3. Wipe the torch body insulator clean with a cloth before installing each fresh set of consumables. The ability
of the insulator to resist arc tracking over its surface is reduced when dirt or other contamination is allowed
to collect there.
4. When the torch is not in use, store it with a full set of front end parts installed. This will prevent dirt from col-
lecting in the torch and will help protect the torch head in case it is accidentally dropped.
5.4 removal and replacement of torch head
Note the position of all components and tape locations before performing disassembly to ensure proper posi-
tioning of components and tape during reassembly. Refer to Figure 6.1.
1. Slide the flex support rearward, onto the cable sleeving until it is approximately 18" (457.2 mm) to the rear of
the handle.
2. Remove the tape near the end of the torch handle.
3. Slide the switch band and switch rearward and off the handle.
4. Slide the cable sleeving rearward.
5. Twist and pull the handle from the torch head and slide it rearward to expose the torch cable connections.
6. Using two wrenches at each connection, unthread the two torch connections. The wrench sizes required are
3/8" (9.5 mm) and 7/16" (11.1 mm).
7. Pull the torch head away from the cable assembly, including the piece of insulation attached. Position the
new torch head and insulation back into the assembly.
8. Using two wrenches at each connection, tighten the two torch connections securely. The torque valve used
at the factory for this step is 25-30 in-lbs (172.4 - 206.8 m-n).
9. Thread the handle back onto the torch head.
10. Slide the switch band and switch onto the handle until it is 2" (50.8 mm) from the torch head. The red splice
connections for the switch lead should be located just behind the handle end.
11. Pull the cable sleeving forward and tape in place behind the handle using vinyl electrical tape.
12. Slide the flex support back onto the handle until it contacts the switch band.
When replacing the handle on the PT-26SL In-line torch, first slide the mylar insulating tube, p/n
0558005623, over the torch tubes & connections until it bottoms against the back of the torch body.
Note
torch body
118
MaINtENaNcE
Mylar Insulating Tube