ESAB SCT-4200 Series, Instructions Manual, Page: 8 / 32

8
mAINTeNANCe INsTRUCTIONs
For all repairs other than those covered below, send the appara-
tus to the nearest ESAB distributor or to ESAB Remanufacturing
Center, 411 S. Ebenezer Road, Florence, SC 29501. Improperly
repaired apparatus is hazardous.
preheat Valves: Leakage around either throttle valve can
usually be corrected by tightening packing nut slightly. If
this does not stop the leakage, replace the valve assembly.
If either preheat valve fails to shut off completely, remove
the valve assembly from the torch. With clean cloth, wipe
the ball in the end of the stem. Then reinsert valve assembly
and tighten it several times with maximum force. If this does
not eliminate leakage, try a new valve assembly. If then the
valve does not shut off completely, send the torch to a repair
station for reseating of the body.
After installing a new throttle valve assembly, tighten the
packing nut until the valve can be turned only with great
difficulty, and set the unit aside, for three or four hours at
least, to set the packing. Then back off the packing nut until
the valve turns readily.
Cutting Valve:
If leakage is detected between the cutting
valve stem cap and the valve, or if the cutting valve fails to
shut off completely, remove cutting valve lever and then
unscrew the valve assembly (08M05), You may either re-
place the entire valve assembly or disassemble the valve
assembly to replace valve stem (19216), seat (19215), and
O-ring (14K11). If the latter, unscrew the valve stem from
the cap (824). Using the new valve stem, seat, and O-ring,
reassemble the valve as follows:
1. Place the new O-ring and retaining washer (10K23) in
the valve nut (19217).
2. Insert the valve spring (23K07) behind the retaining
washer and hold in place firmly while inserting new
seat, and then new valve stem through the valve nut
and O-ring.
3. Screw the valve stem into the valve stem cap firmly.
4. Replace O-ring (14K07) about the seat of the valve
nut if O-ring appears distorted.
5. Screw the entire assembly into the torch body and
tighten firmly with a wrench. Reassemble the cutting
valve lever to the torch body.
Cleaning Cutting Nozzles:
Cutting nozzle orifices should
be cleaned by hand using OXWELD tip cleaners, whenever
a flame distortion is noticed. Maintaining clean orifices is
highly recommended for reducing any incidence of flash-
backs. If you do not have tip cleaners, twist drills of the
correct sizes
(see chart under "Operating Data")
may be
used. Insert the drill carefully, and push it back and forth.
DO NOT TWIST THE DRILL.
To clean the preheat slots on internal nozzles, remove the
external sleeve and use a soft bristled brush (750F99).