Lincoln Electric POWER MIG 140 Manuel Opérateur page 25

POWER MIG 140 & 180 MODELS
M INTEN NCE
SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
• Disconnect input power by removing
plug from receptacle before working
inside POWER MIG 140 & 180
Models.
• Use only grounded receptacle. Do not
touch electrically "hot" parts inside
POWER MIG 140 & 180 Models.
• Have qualified personnel do the
maintenance and trouble shooting work.
ROuTINE mAINTENANCE
POWER SOuRCE COmPARTmENT
No user serviceable parts inside! Do not attempt to perform
service in the power source (fixed) side of POWER MIG 140 &
180 Models. Take the unit to an authorized Lincoln Service Center
if you experience problems. NO maintenance is required.
In extremely dusty locations, dirt may clog the air passages
causing the welder to run hot with premature tripping of thermal
protection. If so, blow dirt out of the welder with low pressure air
at regular intervals to eliminate excessive dirt and dust build-up
on internal parts.
WIRE FEEd COmPARTmENT
1. When necessary, vacuum accumulated dirt from gearbox and
wire feed section.
2. Occasionally inspect the incoming guide tube and clean inside
diameter if necessary.
3. Motor and gearbox have lifetime lubrication and require no
maintenance.
FAN mOTOR
Has lifetime lubrication — requires no maintenance.
WIRE REEL SPINdLE
Requires no maintenance. Do not lubricate shaft.
GuN ANd CABLE mAINTENANCE
FOR mAGNum™ PRO 100L GuN
GUN CABLE CLEANING
Clean cable liner after using approximately 300 lbs (136 kg) of
solid wire or 50 lbs (23 kg) of flux-cored wire. Remove the cable
from the wire feeder and lay it out straight on the floor. Remove
the contact tip from the gun. Using low pressure air, gently blow
out the cable liner from the gas diffuser end.
CAUTION
Excessive pressure at the start may cause the dirt
to form a plug.
Flex the cable over its entire length and again blow out the cable.
Repeat this procedure until no further dirt comes out.
Contact Tips, Nozzles, and Gun Tubes
1. Dirt can accumulate in the contact tip hole and restrict wire
feeding. After each spool of wire is used, remove the contact
tip and clean it by pushing a short piece of wire through the
tip repeatedly. Use the wire as a reamer to remove dirt that
may be adhering to the wall of the hole through the tip.
2. Replace worn contact tips as required. A variable or "hunting"
arc is a typical symptom of a worn contact tip. To install a
new tip, choose the correct size contact tip for the electrode
being used (wire size is stenciled on the side of the contact
tip) and screw it snugly into the gas diffuser.
3. Remove spatter from inside of gas nozzle and from tip after
each 10 minutes of arc time or as required.
4. Be sure the gas nozzle is fully screwed onto the diffuser for
gas shielded processes. For the Innershield process, the
gasless nozzle should screw onto the diffuser.
5. To remove gun tube from gun, remove gas nozzle or gasless
nozzle and remove diffuser from gun tube. Remove both
collars from each end of the gun handle and separate the
handle halves. Loosen the locking nut holding the gun tube in
place against the gun end cable connector. Unscrew gun tube
from cable connector. To install gun tube, screw the locking
nut on the gun tube as far as possible. Then screw the gun
tube into the cable connector until it bottoms. Then unscrew
(no more than one turn) the gun tube until its axis is perpen-
dicular to the flat sides of the cable connector and pointed in
the direction of the trigger. Tighten the locking nut so as to
maintain the proper relationship between the gun tube and
the cable connector. Replace the gun handle, trigger and
diffuser. Replace the gas nozzle or gasless nozzle.
D-1
MAINTENANCE