15
SECTION
6
INSTALLATION, OPERATION AND MAINTENANCE OF PT-34 TORCH
Do not continue to use one end allowing it to erode to a
length shorter than 3/8-in. as shown in Figure 6.3. The
electrode opens the gas flow check valve. If one end is
continually used, it will be too short to open the valve
when reversed.
4. Apply a small amount of lubricant P/N 17672 to the
heat shield as shown in Figure 6.3 or to the O-ring.
Check O-ring for damage whenever the shield is re-
moved. Replace if necessary. (O-ring P/N 950790
is also supplied in spare parts kit.)
Fig6. 2 - Front End Assembly
3/8"
MIN.
LUBRICANT CAN BE
APPLIED TO O-RING OR
HEAT SHIELD
Fig. 6.3 - O-ring and Electrode Maintenance
ELECTRODE
EACH END CAN BE USED
UNTIL IT WEARS TO 3/8"
LONG.
HEAT SHIELD
SWIRL BAFFLE
ELECTRODE
TORCH
NOZZLE (TIP)
PT-34
5. The power cable and switch leads in the service line
should be inspected periodically. If there are any
cuts through the protective sheath or if gas leaks
are noted, replace the damaged component.
By following steps 1, 2, and 3 in Figure 6.5 the service
line can be removed from the torch. To disassemble
the service line, lay the line out straight, remove the
tape from around the switch lead splices, and free the
switch by cutting the leads close to the splices. (Re-
placement switches have extra long leads to make up
for any loss due to cutting.) Remove the rubber boot
from the inlet end of the cable and remove the tape
that secures the sheath at each end. Pull the sheath
off the cable (over small fitting at torch end). Note that
the switch leads wrapped around the power cable are
secured with tape several places along the cable. The
leads, switch cord plug, and strain relief can now be
removed. DO NOT remove the white tape that forms a
band around the power cable at each end. The sheath
is taped to the cable in front of the band which acts as
a shoulder to prevent the sheath from sliding back on
the cable. (Replacement cables have this tape in
place.) If the switch leads are to be replaced, replace
with 16 AWG STRANDED COPPER, 600- VOLT, 90
m
C INSULATED WIRE. Reassemble in reverse order.
6. To reposition the switch on the torch, slide the flex
support back, remove the tape securing the spliced
leads to the power cable, reposition switch, retape
the leads, and pull the flex support back in place.
NOTE: A thin film of silicone lubricant P/N 17672 ap-
plied inside of the flex support will ease the
assembly of this part.
