Gun And Cable Maintenance; Component Replacement Procedures - Lincoln Electric PRO 155 Operator's Manual

D-2
GUN AND CABLE
MAINTENANCE
FOR MAGNUM™ 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 push-
ing 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 the gas nozzle and
from the 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
be screwed onto the diffuser.
MAINTENANCE
5. To remove the gun tube from the gun, remove the
gas nozzle or gasless nozzle and remove the dif-
fuser from the gun tube. Remove both collars from
each end of the gun handle and separate the han-
dle halves. Loosen the locking nut holding the gun
tube in place against the gun end cable connector.
Unscrew the gun tube from the cable connector.
To install the 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 perpendicular 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 noz-
zle or gasless nozzle.
COMPONENT
REPLACEMENT
PROCEDURES
CHANGING THE CONTACT TIP
1. Refer to Figure D.2. Remove the gas nozzle from
the gun by unscrewing it counter-clockwise.
2. Remove the existing contact tip from the gun by
unscrewing it counter-clockwise.
3. Insert and hand tighten the desired contact tip.
4. Replace the gas nozzle.
PRO 155
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