Overload Protection; Changing Liner - Linkoln Electric POWER MIG 140 Manuel De L'opérateur

POWER MIG 140 & 180 MODELS

OVERLOAd PROTECTION

Output Overload
POWER MIG 140 & 180 Models are 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
POWER MIG 140 & 180 Models have 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 POWER MIG 140 & 180 Models and does
not require user intervention. The fan continues to run during
cooling.
Electronic Wire drive motor Protection
POWER MIG 140 & 180 Models have 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
feeder 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
diffuser 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.
FIGURE D.1
Set Screw
Brass Cable Connector
Liner Assembly
(liner bushing to be sealed tight
against brass cable connector)
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
collars 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
FIGURE D.2
locking rib. See Figure D.2.
D-2
MAINTENANCE
1-1/4"(31.8 mm)
Liner Trim Length
Gas Diffuser
Gas Nozzle or
Gasless Nozzle
Counter-clockwise