Shielding Gas Connection; Procedure To Install Drive Rolls And Wire Guides - Lincoln Electric POWER FEED 25M NNS Operator's Manual

POWER FEED™ 25M NNS

SHIELDING GAS CONNECTION

CYLINDER may explode if damaged.
•Keep cylinder upright and chained
to support.
• Keep cylinder away from areas where it may be damaged.
• Never lift welder with cylinder attached.
• Never allow welding electrode to touch cylinder.
• Keep cylinder away from welding or other live electrical
circuits.
• Build up of shielding gas may harm health or kill.
• Shut off shielding gas supply when not in use.
• See American National Standard Z-49.1, "Safety
in Welding and Cutting" Published by the
American Welding Society.
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M 100
AXIMUM INLET PRESSURE IS PSI
Install the shielding gas supply as follows:
1. Secure the cylinder to prevent it from falling.
2. Remove the cylinder cap. Inspect the cylinder valves and regulator
for damaged threads, dirt, dust, oil or grease. Remove dust and dirt
with a clean cloth. DO NOT ATTACH THE REGULATOR IF OIL,
GREASE OR DAMAGE IS PRESENT! Inform your gas supplier of this
condition. Oil or grease in the presence of high pressure oxygen is
explosive.
3. Stand to one side away from the outlet and open the cylinder valve
for an instant. This blows away any dust or dirt which may have
accumulated in the valve outlet.
4. Attach the flow regulator to the cylinder valve and tighten the union
nut(s) securely with a wrench. Note: if connecting to 100% CO 2
cylinder, insert regulator adapter between regulator and cylinder
valve. If adapter is equipped with a plastic washer, be sure it is
seated for connection to the CO 2 cylinder.
5. Attach one end of the inlet hose to the outlet fitting of the flow reg-
ulator. Attach the other end to the welding system shielding gas
inlet. Tighten the union nuts with a wrench.
6. Before opening the cylinder valve, turn the regulator adjusting knob
counterclockwise until the adjusting spring pressure is released.
7. Standing to one side, open the cylinder valve slowly a fraction of a
turn. When the cylinder pressure gage stops moving, open the
valve fully.
8. The flow regulator is adjustable. Adjust it to the flow rate recom-
mended for the procedure and process being used before making a
weld.
WARNING
. (6.9 .)
BAR
PROCEDURE TO INSTALL DRIVE ROLLS AND WIRE
GUIDES
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.
• Only qualified personnel should perform maintenance work.
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1. Turn power off at the welding power source.
2. Release the idle roll pressure arm.
3. Remove the outer wire guide by turning the knurled thumb-
screws counter-clockwise to unscrew them from the feed plate.
4. Rotate the triangular lock and remove the drive rolls.
5. Remove the inner wire guide.
6. Insert the new inner wire guide, groove side out, over the two
locating pins in the feed plate.
7. Install a drive roll on each hub assembly secure with the trian-
gular lock.
8. Install the outer wire guide by aligning it with the pins and tight-
ening the knurled thumbscrews.
9. Close the idle arm and engage the idle roll pressure arm.
Adjust the pressure appropriately
A 5
INSTALLATION
WARNING