Forney MIG 180FI, Operating Manual

Page: 14 / 38

1
4
turn open ALL THE WAY. Note: The drive roller has two wire size
2. Pull the trigger on the gun to allow the gas
to flow. KEEP THE TRIGGER PULLED.
Listen and feel for gas flowing from the
end of the welding gun. If your regulator
has no adjustment, it has been preset at
the factory for a flow of 20 cubic feet per
hour. If your gas regulator has an adjust-
ment to control the gas flow rate, turn the
adjustment key clockwise to increase gas
flow; counterclockwise to reduce flow. For
most welding, the gas flow should be set at
15-20 cubic feet per hour. If no gas is
heard or felt, verify all steps involved in
connecting the gas.
3. Release the trigger.
Note: If welding outside or in a draft, it may
become necessary to set up a wind break to
keep the shielding gas from being blown from
the weld area.
-MAKE SURE TO TURN OFF THE GAS
CYLINDER VALVE WHEN DONE WELD-
ING.
ALIGN AND SET THE DRIVE ROLLER
Before installing any welding wire into the unit,
the proper sized groove must be placed into
position on the wire drive mechanism.
Change the drive roller according to the
following steps:
1. Remove the drive tension by unscrewing
the tension adjusting screw (ALL THE
WAY in a counterclockwise direction). The
drive tension screw will come loose, allow-
ing you to pull the drive tension arm up
away from the drive roller. Make sure to
keep the screw and the spring in place
with the drive tension arm.
2. If there is wire already installed in the
welder, roll it back onto the wire spool by
hand-turning the spool counter-clockwise.
Be careful not to allow the wire to come
out of the rear end of the gun without hold-
ing onto it or it will unspool itself. Put the
end of the wire into the hole on the outside
edge of the wire spool and bend it over to
hold the wire in place. Remove the spool
of wire from the welder.
3. Loosen the drive roller set screw with the
provided hex wrench and pull the drive
roller off the drive shaft.
grooves built into it. When installing the drive
roller the number stamped on the drive roller
for the wire size you are using should be fac-
ing away from you. If you can read the wire
size you are using on the drive roller, it is
installed backwards. Use only the proper size
drive roller when using your welder.
4. Find the side of the drive roller that is
stamped with the same wire diameter as
that of the wire being installed (see Figure
5, and if in metric, see DESCRIPTION).
Push the drive roller onto the motor shaft,
aligning the set screw with the flat side of
the drive shaft. Make sure the side
stamped with the desired wire diameter is
away from you.
Figure 5. Drive Roller
5. Slide the roller onto the shaft so that the
groove in the roller lines up with the inlet
tube and the welding gun liner.
6. Tighten the set screw, while holding the
drive roller in place.
INSTALL THE WELDING WIRE
WARNING
Electric shock can kill! Always turn the
POWER switch OFF and unplug the power
cord from the ac power source before
installing wire.
Be very careful when removing the welding
nozzle. The contact tip on this welder is elec-
trically hot as long as POWER is turned ON.
Make certain POWER is turned OFF.
1. Remove the nozzle and contact tip from