Idle Roll Assembly Replacement; Gun Tube Assembly Replacement; Wire Drive Assembly Removal And Installation; Trigger Assembly Replacement - Lincoln Electric MARQUETTE AUTOPRO 100 SG Manuel De L'opérateur

MAINTENANCE
6. Drive roll may be removed with pliers, as
shown in figure D.6. It may be helpful to
relieve the idle roll tension during this
step.
FIGURE D.6
Idle Roll
Tension
7. Clean the drive roll's groove or obtain a
new replacement drive roll (if needed).
8. Install the drive roll by reversing the
above steps 1 thru 7. Either side of the
drive roll may be face-up.
IDLE ROLL ASSEMBLY
REPLACEMENT
1. Replace if it is degraded from use; for
example, it is becoming galled with alu-
minum deposits.
2. Remove drive roll. (See Maintenance
Section)
3. Remove both idle roll assembly retaining
screws and washers.(See figure D.7)
FIGURE D.7
Retaining screws
and washers
4. Using Needle nose pliers, slowly pull the
idle roll assembly out of the wire drive by
equally working both sides of the tabbed
idle roll spring.
5. Insert the new idle roll assembly into the
wire drive with the correct orientation,
(See figures D.8 and D.9).
Correct orientation. Note that lower spring is
not visible in bore of idle roll bearing at
arrow.
FIGURE D.8
RIGHT
Incorrect orientation. Note that lower spring
is visible in bore of idle roll bearing at arrow.
FIGURE D.9
WRONG
6. Using Needle nose pliers, push the new
idle roll assembly into the wire drive until
it is fully seated.
7. Reinstall the retaining screws and wash-
ers. Do not use the screws to draw the
idle roll into place. Reinstall the drive roll
and wire into the wire drive.
GUN TUBE ASSEMBLY
REPLACEMENT
1. Replace if it is degraded from use; for
example, its insulating tube is breaking
down.
2. Remove liner assembly.
Maintenance Section)
3. Remove left side of handle. Loosen gun
tube nut with wrench. Nut has right-hand
threads. Use adjustable pliers on gun tube
mounting plate to prevent cable assembly
from rotating in gun handle. (See figure
D.10)
FIGURE D.10
D-3
4. Obtain a new replacement gun tube (if need-
ed). Remove locking nut from old gun tube and
install onto new gun tube. Nut should be fully
threaded finger-tight against the insulating
tube.
5. Slide gun tube's external threads through gun
tube mounting plate and screw the gun tube by
hand into the cable connector until the nut pulls
the mounting plate snug against the connector.
6. Tighten the nut and mounting plate to the con-
nector with Torque Wrench 10 to 12 ft.-lbs.
7. Reassemble gun. Be careful not to pinch any
leads between gun handle halves.
WIRE DRIvE ASSEMBLY REMOvAL AND
INSTALLATION
1. There are no serviceable or maintainable parts
inside of the wire drive.
2. Remove liner assembly (See Maintenance
Section figures D.2 and D.3).
3. Remove left side of handle.
4. Disconnect black and red leads from drive
motor. Use care to prevent damage to motor's
fast-on electrical tabs.
5. Slide wire drive out of right handle half.
6. When reinstalling wire drive, note the proper
motor lead connection in the figure. Reconnect
red motor lead to positive (+) terminal, marked
with red dot at arrow. Reconnect black lead to
(See
other motor terminal. (See figure D.11)
FIGURE D.11
7. Reassemble gun. Be careful not to pinch any
leads between gun handle halves.
MAINTENANCE

TRIGGER ASSEMBLY REPLACEMENT

1. There are no serviceable or maintainable parts
inside of the trigger.
2. Remove spool cover and left side of handle.
3. Slide trigger out of right handle half. Disconnect
both white leads from trigger. Use care to pre-
vent damage to electrical leads and the termi-
nals. (See Figure D.12)
FIGURE D.12
White Leads
4. Connect both white leads to the new trigger.
Either lead may be connected to either trigger
pin (non-polarized connections).
5. Slide new trigger into place and reassemble the
gun. Be careful not to pinch any leads between
gun handle halves.
WELDING CABLE ASSEMBLY
REPLACEMENT
1. Generally, there are no serviceable or maintain-
able parts, except for both o-rings on the
machine's power and gas connector; these
seals may be replaced. However, there are
options:
• Damage to the four #22 AWG control leads at
the gun cable's welding machine end (P6 plug)
may be repairable without
"+" Terminal
Red Dot
replacing the entire gun cable. The leads
can be spliced and soldered back togeth-
er, and then reinsulated with heat-shrink
Black Lead
tubing. See Table D.1 in Maintenance
Section for a description of the connec-
tions.
• Otherwise, the damaged gun cable may
be replaced.
D-4
removing or