Lincoln Electric POWER FEED 25M Service Manual page 68

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ROUTINE MAINTENANCE
• Check weld cables, control cables and gas hoses for cuts.
• Clean and tighten all weld terminals.
PERIODIC MAINTENANCE
• Clean drive rolls and inner wire guide and replace if worn.
• Blow out or vacuum the inside of the feeder.
CALIBRATION SPECIFICATION
All calibrations are factory set on the POWER FEED® 25M.
To verify the wire feed speed:
• Assemble a .045 (1.2mm) drive roll kit into the POWER FEED® 25M.
• Load a spool of .045 (1.2mm) electrode and thread the electrode
through the wire drive.
• Adjust the wire feed speed to 300 in/min (7.62m/min).
• Press the COLD FEED switch and measure the actual wire feed
speed with a calibrated wire feed speed tachometer.
• The measured wire feed speed should be within 2% of the set value.
• If no feed speed meter is available, cut the wire at gun tip. Cold inch
for 5 seconds at 300 inches/minute. Measure the wire - should be 24
inches +1, -2 inches.
To verify the voltage display:
• Set the welding power source and POWER FEED® 25M to a CV pro-
cedure that gives steady "spray" transfer in the arc.
• While a weld is being made, measure the voltage from the feed plate
to work with a calibrated volt meter.
• The displayed voltage on the POWER FEED® 25M should be within
2% of the measured value.
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MAINTENANCE
SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
• Do not operate with covers
removed.
• Turn off power source before
installing or servicing.
• Do not touch electrically hot
parts.
• Turn the input power to the welding power
source off at the fuse box before working in the
terminal strip.
• Only qualified personnel should install, use or
service this equipment.
POWER FEED® 25M
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