Lincoln Electric IM991 LN-25 PRO DUAL POWER - Manual (Page 36)

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 main-
tenance work.
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D-1 MAINTENANCE D-1
LN-25™ PRO DUAL POWER
WARNING
SAFETY PRECAUTIONS
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
Flow Meter Validation
Tools required:
• Flow meter reference standard.
• Constant voltage DC welding power source (DC-
400, V-350, CV-400 or equivalent).
To verify the flow meter accuracy:
1. Turn power OFF.
2. Connect the LN-25™ PRO DUAL POWER to the
constant voltage DC welding power source. The
work lead of the LN-25™ PRO DUAL POWER
must be connected to the work terminal of the
power source.
3. Connect a supply of CO
2
to the wire feeder. Do
not exceed the maximum inlet pressure of the wire
feeder.
4. Disconnect the shielding gas hose that connects to
the gun bushing.
5. Connect the shielding gas hose to flow meter refer-
ence standard.
6. Orient the LN-25™ PRO DUAL POWER in a verti-
cal position.
7. Turn power ON.
8. Adjust the flow meter on the LN-25™ PRO DUAL
POWER to 40 scfh while pressing the GAS
PURGE button.
9. Measure the gas flow with the calibrated flow
meter while pressing the GAS PURGE button.
10. The measured flow rate should be between 35
and 45 scfh.
The LN-25™ PRO DUAL POWER flow meter cannot
be calibrated. If the flow meter reads incorrectly,
check for leaks or kinks in the gas hose. Replace the
flow meter if necessary.