MAINTENANCE | ||
|
|
|
MAINTENANCE
Safety Precautions
WARNING
ELECTRIC SHOCK can kill.
•Do not touch electrically live parts such as output terminals or inter- nal wiring.
•When inching with gun trigger, electrode and drive mechanism are “hot” to work and ground and could remain energized several seconds after the gun trigger is released.
•Turn OFF input power at welding power source before installation or changing drive roll and/or guide tubes.
•Welding power source must be connected to system ground per the National Electrical Code or any applicable local codes.
•Only qualified personnel should perform mainte- nance work.
Observe all additional Safety Guidelines detailed throughout this manual.
ROUTINE MAINTENANCE
•Clean and tighten all weld terminals.
•Inspect all weld cables, control cables, gun cables and shielding gas hoses. Repair or replace as nec- essary.
PERIODIC MAINTENANCE
•Clean drive roll grooves.
•Blow out or vacuum the inside of the feeder.
CALIBRATION SPECIFICATION
WARNING
ELECTRIC SHOCK can kill.
•Do not touch electrically live parts.
•When inching with the gun trigger, electrode, wire drive motor and drive mechanism are "hot" to work and ground and could remain energized several seconds after the gun trigger is released.
•Welding power source must be connected to system ground per the National Electrical Code or any applicable local codes.
•Only qualified personnel should perform mainte- nance work.
Calibration of the
To verify if calibration is necessary:
1.Turn off power to the
2.Assemble .045 drive rolls, inner guide and the outer guide into the drive. Remove the gun from the wire feeder if assembled.
3.Load .045 wire into the drive. Cut the wire flush with the end of the gun bushing.
4.Set the WFS knob to 300 ipm.
5.Using the COLD FEED switch, feed wire for 10 seconds.
6.Cut the wire flush with the end of the gun bushing. Measure the length of the wire. If the wire mea- sures 50 ± 2.5 inches then calibration is not required.
Tools required applies to all codes that follow: 5/16" nut driver
3/4" open end wrench WFS meter or RPM meter
Shorting plug. The shorting plug shorts pins 1
&5 of connector J2 on the p.c. board. J2 is a
6 pin molex connector.
To calibrate the LF-72 for Codes 11075 thru 11293:
1.Turn off power to the
2.Disconnect the electrode lead from the feed plate and from the welding power source.
3.Remove the 5 screws securing the wraparound. (The door is not shown for clarity. “See Figure D.1”)
4.Open the idle arm.
5.Turn power on to the
