Overload Protection; Changing Liner - Lincoln Electric POWER MIG 180 DUAL Manuel De L'opérateur

POWER MIG 180 DUAL
®
D-2

OVERLOAD PROTECTION

Output Overload
The POWER MIG 180 DUAL is equipped with a circuit breaker
®
and a thermostat which protects the machine from damage if
maximum output is exceeded. The circuit breaker button will
extend out when tripped. The circuit breaker must be manually
reset.
Thermal Protection
The POWER MIG 180 DUAL has a rated output duty cycle as
®
defined in the Technical Specification page. If the duty cycle is
exceeded, a thermal protector will shut off the output until the
machine cools to a reasonable operating temperature. This is an
automatic function of the POWER MIG
require user intervention. The fan continues to run during cool-
ing.
Electronic Wire Drive Motor Protection
The POWER MIG 180 DUAL has built-in protection for wire drive
®
motor overload.

CHANGING LINER

NOTICE: The variation in cable lengths prevents the interchange-
ability of liners. Once a liner has been cut for a particular gun, it
should not be installed in another gun unless it can meet the
liner cutoff length requirement. Refer to Figure D.1.
1. Remove the gas nozzle from the gun by unscrewing counter-
clockwise.
2. Remove the existing contact tip from the gun by unscrewing
counter-clockwise.
3. Remove the gas diffuser from the gun tube by unscrewing
counter-clockwise.
4. Lay the gun and cable out straight on a flat surface. Loosen
the set screw located in the brass connector at the wire feed-
er end of the cable. Pull the liner out of the cable.
5. Insert a new untrimmed liner into the connector end of the
cable. Be sure the liner bushing is stenciled appropriately for
the wire size being used.
6. Fully seat the liner bushing into the connector. Tighten the set
screw on the brass cable connector. At this time, the gas dif-
fuser should not be installed onto the end of the gun tube.
7. With the gas nozzle and diffuser removed from the gun tube,
be sure the cable is straight, and then trim the liner to the
length shown in the Figure D.1. Remove any burrs from the
end of the liner.
8. Screw the gas diffuser onto the end of the gun tube and
securely tighten.
9. Replace the contact tip and nozzle.
180 DUAL and does not
®
Liner Assembly
(Liner bushing to be sealed tight against
brass cable connector)
D 2
Gas Diffuser
Gas Nozzle or
Gasless Nozzle
Set Screw Brass Cable
Connector
FIGURE D.1
Liner trim length
GUN HANDLE PARTS
The gun handle consists of two halves that are held together
with a collar on each end. To open up the handle, turn the collars
approximately 60 degrees counter-clockwise until the collar
reaches a stop. Then pull the collar off the gun handle. If the col-
lars are difficult to turn, position the gun handle against a corner,
place a screwdriver against the tab on the collar and give the
screwdriver a sharp blow to turn the collar past an internal lock-
ing rib. See Figure D.2.
FIGURE D.2
MAINTENANCE
D-2
1-1/4"(31.8 mm)
Liner Trim Length
Counter-clockwise