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D-1
MAINTENANCE
D-1
TORCH SHIELD REPLACEMENT
It is important that the torch shield be inspected and
replaced on a routine basis. The torch shields
(S24432, -1, -A, -1A) are designed to protect the more
expensive overmolded assembly of the Tandem torch
from arc and heat induced erosion. The shields must
be inspected and replaced on a routine basis. It is
important to replace burnt, eroded or other wise dam-
aged shields during a routine inspection process.
Care must be taken not to introduce moisture or fluid
between shield and the over molded assembly.
Retained moisture between the two components will
induce erosion of the overmolded assembly. When
replacing or inspecting the torch shield, clean compo-
nents free of oil, dirt and moisture before welding.
(See Figure 5)
a) Turn off power to the welding equipment.
b) Remove the nozzle from the torch.
c) Unscrew and remove the contact tips and dif-
fusers.
d) Using a 5/32" allen wrench, remove the four
screws holding the barrel clamp and then remove
the barrel clamp.
e) Slide the barrel off of the torch.
g) Remove the old torch shield from inside the barrel.
Place a new torch shield in the barrel, being sure
the orientation of the torch shield is correct. There
is a small step in the torch shield that seats in the
barrel. When assembled correctly, the face of the
torch shield will be flush with the end of the barrel.
h) Assembly of the remainder of the torch is the
reverse of the earlier steps.
FIGURE 5
Torch Shield Replacement
TANDEM MIG TORCH
SAFETY PRECAUTIONS
Have qualified personnel do the maintenance
work. If a problem cannot be corrected by
following the instructions, take the equipment to
the nearest Lincoln Field Service Shop for
repair.
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ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground
• Always wear dry insulating gloves.
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See additional warning information
throughout this operator’s manual.
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MAINTENANCE
a) Replace worn contact tips as required.
b) Remove spatter from inside of the gas nozzle and
from the tips after every 20 minutes of arc time, or
as required.
c) Replace the nozzle shield when it exhibits signs of
deterioration.
d) For steel or metal cored electrodes, clean the
cable liners after using approximately 2000 lbs of
electrode. Remove the cables from the wire
feeders and extend them so they are straight. Lay
the cables out on the floor, if possible. Remove
the contact tips from the torch. Using an air hose
and only partial pressure, gently blow out the
cable liners from the gas diffuser end. Flex the
cables over its entire length and again blow out
the cable. Repeat this procedure until no further
dirt comes out.
EXCESSIVE PRESSURE MAY CAUSE THE DIRT
TO FORM A PLUG.
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WARNING
CAUTION