Lincoln Electric 180, 140 GUN and Cable, Maintenance, Overload Protection, For Magnum 100L GUN

D-2		MAINTENANCE		D-2
GUN AND CABLE			5. To remove gun tube from gun, remove gas nozzle
MAINTENANCE			or gasless nozzle and remove diffuser from gun
FOR MAGNUM™ 100L GUN			gun handle and separate the handle halves.
			tube. Remove both collars from each end of the
Gun Cable Cleaning			Loosen the locking nut holding the gun tube in
			place against the gun end cable connector.
Clean cable liner after using approximately 300 lbs			Unscrew gun tube from cable connector. To install
(136 kg) of solid wire or 50 lbs (23 kg) of flux-cored			gun tube, screw the locking nut on the gun tube as
wire. Remove the cable from the wire feeder and lay it			far as possible. Then screw the gun tube into the
out straight on the floor. Remove the contact tip from			cable connector until it bottoms. Then unscrew (no
the gun. Using low pressure air, gently blow out the			more than one turn) the gun tube until its axis is
cable liner from the gas diffuser end.			perpendicular to the flat sides of the cable connec-
	CAUTION		Tighten the locking nut so as to maintain the proper
			tor and pointed in the direction of the trigger.
			relationship between the gun tube and the cable
Excessive pressure at the start may cause the dirt
			connector. Replace the gun handle, trigger and dif-
to form a plug.			fuser. Replace the gas nozzle or gasless nozzle.
Flex the cable over its entire length and again blow			OVERLOAD PROTECTION
out the cable. Repeat this procedure until no further			Output Overload
dirt comes out.			The POWER MIG (140, 180 MODELS) is equipped
Contact Tips, Nozzles, and Gun Tubes			with a circuit breaker and a thermostat which protects
			the machine from damage if maximum output is
1. Dirt can accumulate in the contact tip hole and			exceeded. The circuit breaker button will extend out
restrict wire feeding. After each spool of wire is			when tripped. The circuit breaker must be manually
used, remove the contact tip and clean it by push-			reset.
ing a short piece of wire through the tip repeatedly.			Thermal Protection
Use the wire as a reamer to remove dirt that may
be adhering to the wall of the hole through the tip.			The POWER MIG (140, 180 MODELS) has a rated
2. Replace worn contact tips as required. A variable			output duty cycle as defined in the Technical
			Specification page. If the duty cycle is exceeded, a
or “hunting” arc is a typical symptom of a worn con-			thermal protector will shut off the output until the
tact tip. To install a new tip, choose the correct size			machine cools to a reasonable operating temperature.
contact tip for the electrode being used (wire size is			This is an automatic function of the POWER MIG
stenciled on the side of the contact tip) and screw it			(140, 180 MODELS) and does not require user inter-
snugly into the gas diffuser.			vention. The fan continues to run during cooling.
3. Remove spatter from inside of gas nozzle and from			Electronic Wire Drive Motor Protection
tip after each 10 minutes of arc time or as required.
4. Be sure the gas nozzle is fully screwed onto the			The POWER MIG (140, 180 MODELS) has built-in
diffuser for gas shielded processes. For the			protection for wire drive motor overload.
Innershield® process, the gasless nozzle should
screw onto the diffuser.

POWER MIG (140, 180 MODELS)