Forney 140 MP Manuel D'utilisation page 16

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.
20. Select a contact tip stamped with the same diameter as the wire being used.
21. Slide the contact tip over the wire protruding from the end of the gun.Thread the contact tip
into the end of the gun and hand-tighten securely.
22. Install the nozzle on the gun assembly. For best results, coat the inside of the nozzle with
anti-stick spray or gel.
23. Cut off the excess wire that extends past the end of the nozzle.
24. Replace the wire spool casing cover and tighten adjustment knob by turning it clockwise.
25. Connect the welder power cord to the AC power source. Turn the welder ON. Set the VOLTAGE switch.
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