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English
17
Maintenance
Safety precautions
WARNING
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 seconds after the
gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform mainte
nance work.
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.
• Inspect the motor brushes every 6 months. Replace
if shorter than 0.5” (12.7mm).
Calibration specification
Voltmeter validation
(See Figure 14)
To verify the analog voltmeter accuracy:
1. Turn power OFF.
2. Connect the LN-25™ PRO to the constant voltage
DC power supply capable of supply at least 4 amps.
Connect the electrode to the “+” positive terminal and
the work clip to the “-“ negative terminal.
3. Connect a reference voltmeter between the brass
block of the LN-25™ PRO and the work lead.
4. Turn power ON.
5. Energize the power supply. Adjust the power source
output to 20.0 VDC as measured on the reference
meter.
6. Verify that LN-25™ PRO voltmeter reads 20 volts.
Adjust the voltmeter as necessary by turning the
screw on the voltmeter.
A. CALIBRATION SCREW
Figure 14
Wire feed speed validation
Calibration of the LN-25™ PRO may be required when
the P.C. board, wire feed speed potentiometer or motor
is replaced or serviced. Calibration matches the scale on
the name plate to the actual wire feed speed.
To calibrate the LN-25™ PRO:
1. Turn power OFF at the welding source.
2. Remove the spool of wire and the cover from the
feeder. Remove the gun from the feeder plate,
leaving the gun trigger attached to the feeder.
Remove the plastic cover on the feed plate to reveal
the motor gear.
3. Place the WFS range switch in the “high” setting. Set
the WFS knob to
• 50 ipm for K2613-5
• 25 ipm for K2613-7
4. Trigger the LN-25™ PRO and measure the rpm of
the motor gear. Adjust the WFS knob as required
until the rpm measures 8.9 to 9.2 rpm.
5. Insert the shorting plug into the control board for 1
second and then remove the shorting plug. The
shorting plug shorts pins 4 and 7 of J3.
6. Set the WFS knob to
• 800
ipm
for
K2613-5
• 400
ipm
for
K2613-7
7. Trigger the LN-25™ PRO and measure the rpm of
the motor gear. Adjust the WFS knob as required
until the rpm measure 128.0 to 130.0 rpm.
8. Insert the shorting plug into the control board for 1
second and then remove the shorting plug. The
shorting plug shorts pins 4 and 7 of J3.
9. Turn power OFF and reassemble.
A. COVER
B. PC BOARD
Figure 15
A
A
B
