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PRESSURE ARM ADJUSTMENT
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the welding 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 seconds
after the gun trigger is released.
• Only qualified personnel should perform mainte-
nance work.
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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 AA.8):
Aluminum wires between 1 and 3
Cored wires between 3 and 4
Steel, Stainless wires between 4 and 6
FIGURE AA.8
LF-72/74
INSTALLATION
AA-13 AA-13
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WARNING
ALUMINUM
OUTERSHIELD
METALSHIELD
INNERSHIELD
STEEL
STAINLESS
CORED WIRES
SOLID WIRES
6
1
3
2
5
4