D-2
LINER ASSEMBLY REPLACEMENT OR
CLEANING
1. Replacement liner assemblies are factory-made to
the correct length. No cutting is required. The same
liner fits all specified wire sizes and alloys:
2. Remove gas cone, contact tip, and gas diffuser (see
Gas Diffuser Replacement in this Section). Remove
spool cover.
3. Liner removal: Grasp liner with Needle nose pliers at
point A. Gently work liner toward cable connector
until the liner is loose in it. Be careful not to scrape
liner's gas-tight seal (point B) on connector.
Withdraw liner out of gun tube (arrow C). (See figure
D.2)
FIGURE D.2
C
3. Clean out old liner by blowing out with shop air or
obtain a new replacement liner.
4. Slide liner, seal-end first, into gun tube. Grasp liner
with pliers at A. Gently push liner into connector. B:
Check that liner passes through slot in wire feeder.
C: Stop pushing when liner is 1.00 to 1.25 inches
from end of gun tube. (See figure D.3)
FIGURE D.3
A
C
5. Liner installation: See step 4 above.
MAINTENANCE
B
A
B
MAGNUM 100SG SPOOL GUN
6. Reinstall gas diffuser (see Figure D.1) and thread
into place. Allow the diffuser to push the liner into its
final position. Tighten to 41 to 47 in.-lbs. with a
torque wrench.
7. Reinstall contact tip and gas cone.
DRIVE ROLL REPLACEMENT
1. The same drive roll fits all specified wire sizes and
alloys (See Table D.1).
2. Replace the drive roll if its feeding groove has
become worn or cannot be cleaned of galled alu-
minum.
3. Drive roll removal: Remove wire from the wire drive.
Unlock drive roll by rotating twist-lock in either direc-
tion. (See figure D.4 and figure D.5) .
4. Twist-lock is rotated to the locked position, securing
drive roll in place.
FIGURE D.4
5. Twist-lock is rotated to the unlocked position, allow-
ing drive roll removal.
FIGURE D.5
D-2
Twist-lock
Locked position
Twist-lock
Unlocked position