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D-1
MAINTENANCE
D-1
MAGNUM™ PRO 350 and 550 FUME GUNS
RECOMMENDED TOOLS
• Adjustable-jaw pliers
• Welding pliers (optional)
• 7/16 inch open-end wrench (gas diffuser, gas plug or
fitting, gun tube wrench flats)
• 1-1/8 inch open-end wrench (incoming connector)
• 9/64 inch allen wrench (handle screws)
• 5/64 inch allen wrench (liner set screw)
• 3/4 inch open-end wrench (cable cone)
• 7/8 inch open-end wrench (cable nut)
• 3/32 inch dia. drift (gun tube lock removal)
Hammer
• Wire cutter
• Wire stripper
• Needlenose pliers
• External snap ring pliers (gun tube spiders)
• Terminal crimping tool
• Flashlight
• Hand-held electrical meter
• Tape measure or 6-inch scale
• Oetiker clamp tool
• Oetiker clamp crimping tool
ROUTINE CLEANING AND
INSPECTIONS
1. Clean out fume collection nozzle, fume tube
assembly, and handle cooling slots
2. Wipe off dust and debris
3. Clean out the inside of the liner assembly (See
Liner Assembly Cleaning or Replacecment,
Installation Section)
4. Check that the gun tube and incoming connector
assembly are properly tightened to the cable
assembly
5. Replace any warning or product identification
decals that have become illegible
GAS DIFFUSER REPLACEMENT
(See Select and Install Consumable Parts,
Installation Section)
This part may need to be replaced if it has accumulat-
ed excessive spatter and cannot be cleaned:
1. Remove fume collection nozzle, gas nozzle, and
contact tip.
2. Install gas diffuser and thread into place in gun
tube. Tighten diffuser to 41 to 47 in.-lbs. with
wrench.
LINER ASSEMBLY CLEANING OR
REPLACEMENT
• Clean out old liner by straightening out the gun and
gently blowing out the liner with shop air or obtain a
new liner assembly.
• Replacement liner assemblies are factory-made to a
length longer than the gun. Cutting is required.
1. Straighten out the gun. Remove fume collection
nozzle, gas nozzle, contact tip, and gas diffuser
(See Liner Assembly Cleaning or
Replacecment, Installation Section).
2. Loosen liner set screw and remove old liner by
sliding it rearward from the gun.
3. Install new liner and retighten set screw. Use care
not to over-tighten set screw or liner will be
deformed and damaged.
4. Cut new liner to length, measuring 0.500 to 0.625
inches from the end of the gun tube. Deburr the
end of the liner.
5. Reinstall gas diffuser by threading into place.
Tighten to 41 to 47 in.-lbs. with wrench.
6. Reinstall contact tip, gas nozzle, and fume collec-
tion nozzle.