Lincoln Electric IDEALARC SP-255 - Manual (Page 33)

D-1 MAINTENANCE
IDEALARC SP-255
GUN TUBES AND NOZZLES
1. Replace worn contact tips as required.
2. Remove spatter from inside of gas noz-
zle and from tip after each 10 minutes of
arc time or as required.
CABLE CLEANING
Clean cable liner after using approximately
300 pounds (136 kg) of electrode. Remove
the cable from the wire feeder and lay it out
straight on the floor. Remove the contact tip
from the gun. Using an air hose and only
partial pressure, gently blow out the cable
liner from the gas diffuser end.
Excessive pressure at the start may
cause dirt to form a plug.
Flex the cable over its entire length and
gain blow out the cable. Repeat this proce-
dure until no further dirt comes out.
CONTACT TIP AND GAS
NOZZLE INSTALLATION
1. Choose the correct size contact tip for
the electrode being used (wire size is
stencilled on the side of the contact tip)
and screw it snugly into the gas diffuser.
2. Screw the appropriate fixed gas nozzle
fully onto the diffuser. Either the standard
.50" (12.7 mm) flush nozzle or other
optional flush or recessed (spray arc)
nozzle sizes may be used. (See
Accessories section.)
3. Be sure the nozzle insulator is fully
screwed onto the gun tube and does not
block the gas holes in the diffuser.
4. If using an optional adjustable slip on
nozzle, slip the appropriate gas nozzle
onto the nozzle insulator. Either a stan-
dard .40" (12.7 mm) or optional .62"
(15.9 mm) I.D. slip-on gas nozzle may be
used and should be selected based on
the welding application.
SAFETY PRECAUTIONS
ELECTRIC SHOCK can
kill.
• Have qualified person-
nel do the maintenance
and trouble shooting
work.
• Turn the input power off
at the fuse box before
working on equipment.
• Do not touch electrically
hot parts..
ROUTINE MAINTENANCE
GENERAL MAINTENANCE
In extremely dusty locations, dirt may clog
the air passages causing the welder to run
hot. Blow dirt out of the welder with low-
pressure air at regular intervals to eliminate
excessive dirt and dust build-up on internal
parts.
The fan motors have sealed ball bearings
which require no service.
DRIVE ROLLS AND GUIDE
TUBES
After every coil of wire, inspect the wire
drive mechanism. clean it as necessary by
blowing with low pressure compressed air.
Do not use solvents for cleaning the idle roll
because it may wash the lubricant out of the
bearing. All drive rolls are stamped with the
wire sizes they will feed. If a wire size other
than that stamped on the roll is used, the
drive roll must be changed.
For instructions on replacing or changing
drive roll, see “Wire Drive Roll” in Operation
section or instruction decal inside the SP-
255 door.
WARNING
CAUTION