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The pressure arm controls the amount of force the
drive rolls exert on the wire. Proper adjustment of both
pressure arm gives the best welding performance. For
best results, set both pressure arms to the same
value.
Set the pressure arm as follows (See Figure B.4):
Aluminum wires between 1 and 3
Cored wires between 3 and 4
Steel, Stainless wires between 4 and 6
B-5
B-5
OPERATION
ALUM INUM
OUTERSHIELD
METALSHIELD
IN NERSHIEL D
STEEL
STAIN LESS
COREDWIRES
SOL ID W IRES
6
1
3
2
5
4
FIGURE B.4
POWER MIG
®
256
FEEDING WIRE ELECTRODE
When triggering, the electrode and drive mecha-
nism are electrically "hot" relative to work and
ground and remain "hot" several seconds after
the gun trigger is released.
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NOTE: Check that drive rolls, guide plates and gun
parts are proper for the wire size and type being used.
Refer to Table C.1 in Accessories section.
1. Turn the Readi-Reel or spool until the free end of
the electrode is accessible.
2. While securely holding the electrode, cut off the
bent end and straighten the first six inches. (If the
electrode is not properly straightened, it may not
feed properly through the wire drive system).
3. Release the pressure on the idle roll by swinging the
adjustable pressure arm down toward the back of
the machine. Lift the cast idle roll assembly and
allow it to sit in an upright position. Leave the outer
wire guide plate installed. Manually feed the wire
through the incoming guide bushing and through the
guide plates (over the drive roll groove). Push a
sufficient wire length to assure that the wire has fed
into the gun and cable assembly without restriction.
Reposition the adjustable pressure arm to its origi-
nal position to apply pressure to the wire.
4. Press gun trigger to feed the electrode wire through
the gun.
IDLE ROLL PRESSURE SETTING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the weld-
ing power source before installation or
changing drive rolls and/or guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several sec-
onds after the gun trigger is released.
• Only qualified personnel should perform mainte-
nance work.
------------------------------------------------------------------------
WARNING
WARNING