Aluminum Wire Preparations - Lincoln Electric LF-72/74 Service Manual

AA-18

ALUMINUM WIRE PREPARATIONS

WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the dis-
connect switch before working on
this equipment.
• Do not touch electrically hot parts.
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Welding with aluminum filler wires requires extra care.
Aluminum wire is softer and not as stiff as steel wires,
it is important to keep aluminum wire free of dirt and
scratches. Limit gun length to 10 Ft.(3.0 m) for best
results and use a spool cover if feeding from a spool.
To prevent scratching of the aluminum wire, remove
the ball bearings from the ball housing as follows.
Tools required: (See Figure AA.12b)
• 9/64" Hex key wrench
1. Turn off power at the welding power source.
2. Remove the o-ring holding the ball bushing assem-
bly to the back of the wire feeder. Remove the ball
bushing assembly.
FIGURE AA.12b
3. Remove the three socket head cap screws from the
ball bushing assembly. Caution: as the screws are
being loosened, the balls may fall free from the
assembly. Remove the balls and the steel washer.
INSTALLATION
"O" RING
LF-72/74
FIGURE AA.13
4. Place the ball bushing housing into the wire feeder
case and secure with the "O" ring.
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