Lincoln Electric IM872 LF-74 WIRE FEEDER - Manual (Page 20)

A-12 INSTALLATION
LF-74
A-12
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 sec-
onds 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 pres-
sure 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 A.8):
Aluminum wires between 1 and 3
Cored wires between 3 and 4
Steel, Stainless wires between 4 and 6
FIGURE A.8
ALUMINUM
OUTERSHIELD
METALSHIELD
INNERS HIELD
STEEL
STAINLE SS
CORED WIRES SOLID WIRES
6
1
3
2
5
4