Maintenance Instructions - ESAB W-300 Manuel D'instructions

SECTION 4

MAINTENANCE INSTRUCTIONS

For all repairs other than those covered below, send the ap-
paratus to your welding equipment distributor or to ESAB
Remanufacturing Center, 411 S. Ebenezer Road, Florence, SC
29501. Improperly repaired apparatus is hazardous.
Torch Handle and Cutting Attachment Throttle Valves -
Leakage around throttle valve can almost always be corrected
by tightening the packing nut slightly. If necessary, replace the
complete throttle valve assembly as directed below. If a valve will
not shut off completely loosen the packing nut and unscrew the
throttle valve assembly from the body. Wipe the stainless steel
ball seat on the valve stem, and the seating surface in the body,
with a clean cloth. Then reinstall the valve, retighten the packing
nut, and operate the valve several times, closing it with maximum
force. If this does not end the leakage, install a new throttle valve
assembly. When you do so, tighten the packing nut
Cutting Valve — If leakage is detected around the cutting valve,
or if the valve does not shut off completely when cutting oxygen
valve lever is released, unscrew the lock screw (see illustration
on pg. 8) with a spanner wrench. When the thread is fully dis-
engaged, lift out the valve assembly. Then tilt the attachment
and let the valve spring drop out in you hand.
Now pull the lock screw off the valve stem and remove seat and
retainer from the stem. Examine the stem carefully. If either the
seating surface or the cylindrical section that runs in the valve
screw is marred, replace the stem with a new part. Always replace
the seat with a new part. Replace the small 'O'-ring and replace
it if it is not in excellent condition. Place new seat on stem, slide
on the retainer, and insert stem in lock screw (be sure the lock
screw has both 'O'-rings in position). Finally, slide valve spring
into body, insert valve assembly, and tighten lock screw.
Cutting Attachment Mixer — To remove the mixer for cleaning
or replacement, back off locknut (56K07) until it reaches the
end of the threads on the adaptor (19K07). Continue turning
it, with a wrench, to unscrew the adaptor from the attachment
body. Then remove the mixer by grasping the end of the mixer
carefully with a pair of pliers and pull it out. Clean mixer center
orifice with a No. 55 cleaning drill and the cross-drillings with a
No. 66 drill, or soak the mixer overnight in a solution of OXWELD
Nozzle Cleaning Compound (P/N 761F00), rinse, and blow dry
with clean air.
Inspect all 'O'rings and replace them if they are not in good
condition. Reassemble in reverse order, and tighten locknut
against body securely.
Welding Heads and Cutting Nozzles — Welding heads and cut-
ting nozzle orifices should be cleaned by hand using OXWELD
tip cleaners, whenever a flame distortion is noted. Maintaining
clean orifices is highly recommended for reducing any incidence
of flashbacks. If you do not have tip cleaners, twist drills of the
correct sizes (see Tables) may be used. Insert the drill carefully,
and push it back and forth. DO NOT TWIST THE DRILL.
If a welding tip requires replacement, secure the front end of
the mixer throat in a vise and unscrew the tip. Before installing
a new tip, be sure it matches the mixer throat in size (both parts
are size-stamped). Always tighten the new tip as much as you
can without bending it.
To clean a welding head mixer, unscrew it from the mixer
throat, soak it overnight in a solution of OXWELD Nozzle
Cleaning Compound, rinse with clear water, dry with a jet of
air.
Check the condition of 'O'-rings on the welding heads periodi-
cally. If they appear to be in poor condition, or are so worn
that the head can be inserted in the handle without notice-
able resistance, replace them.
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MAINTENANCE