Lincoln Electric 125 Operator's Manual page 13

WIRE FEEDER WELDERS (125, 140)
See Figure B.3
8. WELDING GUN CONNECTOR BUSHING & THUMBSCREW –
Provides electrical power to the welding gun. The thumbscrew
holds the welding gun into the connector block. (Front Cover
and Side Door have been removed for clarity of Items 8 and
9).
9. OUTPUT TERMINALS - Connections to these terminals deter-
mines the welding polarity, depending on whether the process
being used is flux-cored welding or MIG welding.
See Figure B.4
10. WIRE SPOOL SPINDLE AND BRAKE – Holds a 4"(102mm)
diameter spool. Use the 2"(51mm) spindle adapter included
with the machine for 8" (203mm) diameter spools. The wing
nut sets the brake friction to prevent the spool from over
rotating when the trigger is released. Tightening the wing nut
will prevent the spool from rotating when the trigger is
released.
See Figure B.5
11. WIRE DRIVE & COMPONENTS – Feeds wire from the wire
spool through the drive and through the welding gun to the
work piece.
a. Drive Roll – Drives the wire through the drive system. The
drive roll has grooves to match the specific wire type and
diameter. Refer to Table B.1 for available drive rolls.
b. Incoming & Outgoing Guide – The wire is fed through
both guides. The Pivot Arm Assembly, Tension Arm
Assembly and Drive Roll keep pressure on the wire in the
groove.
c. Tension Arm Assembly – Turning clockwise increases the
forward force on the wire and turning counterclockwise
decreases the force.
See Figure B.5a
Magnum 100SG / Magnum 100L Switch - The spool gun
switch is available on 140 Amp machines only. The Magnum
100SG Spool Gun can be purchased at authorized retailers. The
part number is K2532-1.
FIGURE B.3
8
FIGURE B.4
FIGURE B.5
PIVOT ARM ASSEMBL Y
BEARING
FIGURE B.5a
SWITCH
MAGNUM 100SG
B 3
OPERATION
9
OUTGOING GUIDE
TENSION ARM ASSEMBL Y
WIRE SPOOL
.035" (0.9mm)
NR-211-MP
INCOMING GUIDE
DRIVE ROLL
MAGNUM 100L