Maintenance & Servicing; General Maintenance; Troublshooting - Forney 270 MIG Manual De Instrucciones

Maintenance & Servicing

General Maintenance

• Always weld clean, dry and well-prepared material.
• Hold gun at a 45° angle to the workpiece with nozzle about 1/2" from the surface.
• Move the gun smoothly and steadily as you weld.
• Avoid welding in very drafty areas. A weak, pitted and porous weld will result due to air
blowing away the protective welding gas.
• Keep wire and wire liner clean. Do not use rusty wire.
• Sharp bends or kinks in the welding cable should be avoided.
• Always try to avoid getting particles of metal inside the machine since they could cause short
circuits or other damage.
• If available, use compressed air to periodically clean the hose liner, especially when
changing wire spools. NOTE: Disconnect from power source when carrying out this
operation.
• Using low pressure air (3/5 Bar=20-30 PSI), occasionally blow the dust from the inside of
the welder. This keeps the machine running cooler. NOTE: Do not blow air over the printed
circuit board and electronic components.
• The wire feed roller will eventually wear during normal use. With the correct tension the
pressure roller must feed the wire without slipping. If the pressure roller and the wire feed
roller make contact when the wire is in place between them, the wire feed roller must be
replaced.
• Check all cables periodically. They must be in good condition and not cracked.
Troubleshooting
This chart will assist you in resolving common problems you may encounter. These are not all the
possible solutions.
PROBLEM
No "power" from welder.
Fan operates normally, but
when gun trigger pulled,
there is no wire feed, weld
output or gas flow.
Feed motor operates but
wire will not feed.
POSSIBLE CAUSE
Input cable or plug malfunction.
Wrong size fuse.
Faulty trigger gun.
Thermostat intervention.
Faulty wire feeding motor (rare).
Insufficient feed roller pressure.
Burr on end of wire.
Liner blocked or damaged.
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POSSIBLE SOLUTION
Check for proper input cable
connection.
Check fuse and replace as
necessary.
Replace torch trigger.
Allow welder to cool. When the
pilot lamp/switch on the front panel
goes dark indicates the thermostat
has closed.
Replace wire feeding motor.
Increase roller pressure.
Re-cut wire square with no burr.
Clear with compressed air or
replace liner.
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