Shutdown Procedure; Service; Service Procedure; Inspect And Service Torch Regularly - ESAB MT-400EHD Instructions For Use Manual

IMPORTANT
Never use torch as a hammer to remove spatter.

3.4 SHUTDOWN PROCEDURE

When welding is completed, shut down the equipment
as follows:
a. Shut OFF all power controls.
b. Turn off gas at source.
c. Place torch in safe location.
Do not allow protruding welding wire to touch a
grounded metal surface.
d. Coil or drape hose and cable without sharp bends.
IV. SERVICE

4.1 SERVICE PROCEDURE

Always shut OFF all power and gas supplies be-
fore attempting inspection, maintenance, or repair
unless otherwise instructed here. Remove main
line fuses or lock and red tag switches.
If power source is ON, electrode wire becomes elec-
trically HOT when gun trigger is pressed, and drive
rolls start. Keep fingers clear of drive rolls. Do
NOT touch wire or metal parts contacting it or al-
low wire to touch grounded metal. It may cause
possibly fatal shock, fire or other damage. (See
Operating Safety Precautions in preceding section,
item 3.1).
Equipment which is not functioning properly should not
be used until all required repairs have been completed
and the equipment has been tested to ascertain that it
is in proper operating condition.
Inspection, troubleshooting, and repair of this equip-
ment as indicated in this manual may ordinarily be un-
dertaken by a competent person having at least gen-
eral experience in the maintenance and repair of equip-
ment of this nature.
No such maintenance or repair should ever be un-
dertaken by anyone not having such qualifications.
It is recommended that worn parts be replaced with
parts manufactured and sold by ESAB Welding & Cut-
ting Products.
Except for inspection, troubleshooting, and repairs in-
dicated in this manual, it is recommended that all other
servicing be done by an authorized service facility.
Contact the Distributor from whom purchased for as-
sistance.
If so advised, the unit should be sent to the authorized
service facility, adequately packaged, in the original
shipping container, if possible, and shipped prepaid,
with a statement of the observed deficiency. Return
transportation charges are to be paid by Buyer. In all
cases other than when warranty is applicable, repairs
will be made at current list price for the replacement
part(s) plus a reasonable labor charge.

4.2 INSPECT AND SERVICE TORCH REGULARLY

a. Clean accumulated dirt from all areas, particularly
electrical parts where metallic particles can cause
short circuits. Blow out liner with compressed air
when changing wire. Compressed air should NOT
exceed 30 psig (2.1 bar).
b. Tighten loose hardware including all gas and elec-
trical connections. (Loose power connections over-
heat during welding).
c. Regularly inspect insulation on equipment for pos-
sible damage or wear. Check for frayed and
cracked insulation. Before using equipment again,
make necessary repairs or replace all worn or dam-
aged insulation, hoses, cables, conduit, and con-
nectors.
With any repairs, make sure that metallic parts do
not protrude from insulation. Damaged insulation
can expose the conductor. If it should touch
grounded metal, it would create an arc flash. If it
should touch the body, it could cause a fatal shock.
d. Periodically remove any weld spatter or foreign
matter which has accumulated around the nozzle
orifice and contact tip. To ease spatter removal,
spray a thin film of anti-spatter compound on con-
tact tip and nozzle before welding and reapply the
compound after cleaning of tip and nozzle.
e. Replace contact tip if worn.
f. Remove any accumulation around trigger that may
make it stick, or cause short circuits.
To avoid shock, do not depress trigger while han-
dling contact tip or nozzle parts or while disassem-
bling torch.
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