Forney 319 Manuel D'utilisation page 16

tension arm. Pull the drive tension arm away from the drive roller.
3. If needed, loosen the tension adjusting screw on the drive tension arm. Pull the drive tension
arm up to allow access to the drive roll within the wire drive system. Rotate the black drive
roll cap counterclockwise and remove it to reveal the metallic drive roll. Pull the drive roll
off its shaft. NOTE: The drive roll has two wire size (.030" and .035") grooves built into it.
Ensure the corresponding groove and wire size are used. Replace the drive roll onto its shaft
and drive roll cap onto the drive roll.
4. Find the side of the drive roller that is stamped with the same wire diameter as that of the
wire being installed. Push the drive roller onto the drive roller shaft, with the side stamped
with the desired wire diameter facing you.
5. Reinstall the drive roller cap and lock in place by turning it clockwise.
6. Remove the nozzle and contact tip from the end of the gun assembly.
7. Open the wire spool casing, located at the rear of the spool gun, by turning the retaining
knob counterclockwise.
8. Unwrap the spool of wire and find the end of the wire.
9. After checking to make sure that your welder is disconnected from the AC power source, free
the leading end of the wire from the spool, but do not let go of it until told to do so, or the
wire will unspool itself.
10. Using a wire cutter, cut off the bent portion at the end of the wire so that you are left with a
straight section of wire.
11. Unroll about 6" of welding wire from the wire spool.
12. Insert the leading end of the wire into the inlet guide tube (located in the Wire Spool
Casing). Then push it across the drive roller and into the gun assembly about 6".
13. Line the wire up in the appropriate top groove of the drive roller, then push the drive tension
arm against the drive roller.
14. Flip the quick release drive tensioner back into position on the drive tensioner arm.
15. Tighten (turn clockwise) the drive tension adjusting knob until the tension roller is applying
enough force on the wire to prevent it from slipping out of the drive assembly.
16. Let go of the wire.
17. The welding wire should always come off the top of the spool into the drive mechanism.
NOTE: The purpose of the drive brake is to cause the spool of wire to stop turning at nearly
the same moment that wire feeding stops.
18. Set the Drive Brake tension. NOTE: It is necessary to release the Drive Tensioner Arm while
you are setting the Drive Brake Tension. Make sure you return the Drive Tension Arm to its
locked position after adjusting the Drive Brake Tension.
a) With one hand, turn the wire spool counterclockwise. This will cause the wire to feed
through the gun assembly continue turning it while adjusting the tension on the spool.
b) With your free hand, tighten (turn clockwise) the drive brake adjustment knob.
c) Stop tightening when drag is felt on the wire spool that you are turning. Then stop hand-
turning the wire spool. NOTE: If too much tension is applied to the wire spool, the wire
will slip on the drive roller or will not be able to feed at all. If too little tension is applied,
the spool of wire will want to unspool itself. Readjust the drive brake tension as necessary
to correct for either problem.
19. Trim the wire which is sticking out the end of the spool gun to about 1/2" in length.
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