Maintenance And Trou- Bleshooting; General Maintenance; Bleshooting - Sears Craftsman 934.20105 Owner's Manual

MAINTENANCE AND TROUBLESHOOTING Page 26
MAINTENANCE AND TROUBLESHOOTING
GENERAL MAINTENANCE
This welder has been engineered to give many
years of trouble-free service providing that a few
very simple steps are taken to properly maintain it.
1. Keep the wire drive compartment lid closed at all
times unless the wire needs to be changed or
the drive tension needs adjusting.
2. Keep all consumables (contact tips, nozzles,
and gun liner) clean and replace when neces-
sary. See CONSUMABLE MAINTENANCE
AND TROUBLESHOOTING later in this section
for detailed information.
3. Replace powercord, ground cable, ground
clamp, or gun assembly when damaged or
worn.
4. Periodically clean dust, dirt, grease, etc. from
your welder. Every six months or as necessary,
remove the side panels from the welder and
air-blow any dust and dirt that may have accu-
mulated inside the welder.
ELECTRIC SHOCK CAN KILL? To reduce risk of
electric shock, always unplug the welder from its
AC power source before removing side panels.
CONSUMABLE MAINTENANCE
AND TROUBLESHOOTING
IT IS VERY IMPORTANT TO MAINTAIN THE
CONSUMABLES TO AVOID THE NEED FOR
PREMATURE REPLACEMENT OF THE GUN
ASSEMBLY.
1. The GUN LINER is intended to provide an unre-
stricted path for the welding wire to flow through
the gun assembly. Over time it will accumulate
dust, dirt, and other debds. Replacement is
necessary when these accumulations begin to
restrict the free flow of wire through the gun
assembly.
TO REPLACE A GUN LINER:
When removing or installing a gun liner, care must
be taken not to kink or otherwise damage it or
replacement will be necessary.
a. Turn POWER SWITCH to the OFF position.
b. Remove wire from gun assembly and gun
assembly from welder.
c. Remove nozzle and contact tip from gun
d. Loosen set screw holding liner collet in place
at rear of gun.
e. Lay gun assembly out in a straight line.
f,
g°
h,
Holding rear of gun assembly, grasp liner
collet and pull liner out of gun assembly.
Insert new liner into gun assembly and push
all the way through being careful not to kink
the liner. The excess liner wilt protrude from
the end of the gun.
With the gun assembly lying in a straight
line, mark the liner at the end of the gun's
gas diffuser.
Hold the gun handle firmly in place, then
gently pull outward on the excess liner so
that the mark you made is about 118" out
past the end of the gas diffuser.
Using a wire cutter, cut the liner at the end of
the gas diffuser so that the liner ends up
recessed into the gas diffuser about 1/8", then
use a file to remove any burrs on the liner
where the cut was made.
k. Tighten the set screw, but DO NOT OVER
TIGHTEN or damage to the collet may re-
sult.
1. Reinstall gun assembly into welder (see IN-
STALL WELDING GUN ASSEMBLY in the
ASSEMBLY AND INSTALLATION section).