Overload Protection; Changing Liner; Gun Handle Parts - Lincoln Electric MARQUETTE AutoPro Serie Manual Del Operador

D-2

OVERLOAD PROTECTION

Output Overload
The AutoPro™ (140/180 MODELS) are equipped with
a circuit breaker and a thermostat which protects the
machine from damage if maximum output is exceed-
ed. The circuit breaker button will extend out when
tripped. The circuit breaker must be manually reset.
Thermal Protection
The AutoPro™ (140/180 MODELS) have a rated out-
put 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 AutoPro™
(140/180 MODELS) and does not require user inter-
vention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The AutoPro™ (140/180 MODELS) have built-in protec-
tion for wire drive motor overload.

CHANGING LINER

NOTE: The variation in cable lengths prevents the
interchangeability of liners. Once a liner has been cut
for a particular gun, it should not be installed in anoth-
er gun unless it can meet the liner cutoff length
requirement. Refer to Figure D.2.
1. Remove the gas nozzle from the gun by unscrew-
ing 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 connec-
tor 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.2.
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.
MAINTENANCE
Set Screw
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 collars reach a stop. Then
pull the collars off the gun handle. If the collars are dif-
ficult 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 locking rib. See Figure D.3.
AUTOPRO™ (140/180 MODELS)
FIGURE D.2
Liner trim length
Gas Diffuser
Brass Cable
Connector
Gas Nozzle or
Gasless Nozzle
FIGURE D.3
Counter-clockwise
D-2
1-1/4"(31.8 mm)
Liner Trim Length