Lincoln LN-7 - Manual (Page 14)

Operating Instructions
are at the center of the slots in the carboard coil liner.
This provides the positive compression of the coil
needed for trouble free wire feeding. (See photo).
C. Put the cover plate on the reel so the four arms of the
cover straddle and are in line with the spring loaded
arm of the reel proper.
pin enters one of the holes in the back side of the spool.
Replace and tighten the locking knob. Be certain the wire
comes off the reel in a clockwise direction. The spool
should turn freely without any overrun. Adjust the brake
tension with the hex head screw on the shaft hub, until
the reel turns freely but with little or no overrun.
The Lincoln Electric Company
Cleveland, Ohio 44117
4. Tighten the cover as much as possible by hand. DO NOT
hammer on the spinner nut arms.
5. Cut and remove only the tie wire holding the free end of
the coil. Insert the free end into one of the holes in the
cover and secure it by bending it back. Cut and remove
the remaining tie wires.
NOTE; Always be sure the free end of the coil is
securely held while the tie wires are being cut and until
the wire is feeding through the drive rolls. Failure to do
this will result in “back lashing” of the coil, which may
tangle the wire. A tangled coil will not feed so it must
either be untangled or discarded.
6. Replace the reel on the wire feeder. Grasp the shaft
knob, pull it out and swing it across the reel hub.
7. Turn the reel until the free end of the electrode is acces­
sible. While tightly holding the electrode, cut off the
bent end. Straighten the first six inches and insert it
through the wire guide to the drive roEs. Press the gun
trigger untE the rolls pick up the wire and feed it
through the gun cable.
WARNING: When inching, the electrode is always “hot” to
ground.
September 1971
Sec. J3.1.6
Wire Reel Loading — 10 to 30 Pound Spools
Remove the locking knob from the shaft. Place the 25
lb. spool on the shaft making certain the brake driving
SCRPW
Sec. J3.1.7
Sequence of Welding
See page 2 for general arc welding safety precautions.
1. Install the LN-7 per Sec. J2.
2. Load the wire reel per Sec. J3.1.5 or J3.1.6.
3. Ground the work.
4. Set the power source polarity switch or properly con­
nect the electrode and ground lead for the correct elec­
trode polarity.
5. Set the voltage using the power source controls per Sec.
J3.1.1.
6. Set the current per Sec. J3.1.1.
7. Press the gun trigger to inch the wire untE it sticks about
3/4” beyond the end of the gun. Position the gun so the
electrode is l^tly touching the work. Avoid pushing the
electrode against the work before starting to weld. Press
the gun trigger to start welding. Current can be adjusted
whEe welding using the ‘Wire Feed Speed’ control on the
LN-7.
8. To stop welding, release the gun trigger and lift the gun
from the work. The wire feed motor stops and the weld­
ing circuit is de-energized the moment the trigger is
released. If an auxEiary device is connected to #7 and
#32 in the LN-7 control box, (See Sec. J2.5.5), this
device is de-energized when the trigger is released.
May 1975
Sec. J3.1.9
Wire Reel Changing
At the end of a coE remove the last of the old electrode
coil from the conductor cable with the foUowing
procedures:
1. Cut the end of the electrode off at the gun end. Do not
break it off by hand because this puts a slight bend in
the wire making it difficult to pull it back through the
nozzle.
2. Uncouple the gun conductor cable from the connection
block on the LN-7 drive unit.
3. Lay the gun and cable out straight.
4. Using pliers to grip the wire, puU it out of the cable from
the connector end. Do not puU it from the gun end.
5. After the electrode has been removed, connect the gun
conductor cable back to the LN-7.
Load a new reel of electrode per the instructions in Sec.
J3.1.5 or J3.1.6.
September 1971
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