Lincoln Electric IM790 SP-175 Plus - Manual (Page 26)

D-3 D-3 MAINTENANCE
COMPONENT REPLACEMENT
PROCEDURES
CHANGING THE CONTACT TIP
1. Unplug or turn power switch to Off “ O ” position.
2. Refer to Figure D.2. Remove the gas nozzle from
the gun by unscrewing counter-clockwise.
3. Remove the existing contact tip from the gun by
unscrewing counter-clockwise.
4. Insert and hand tighten desired contact tip.
5. Replace gas nozzle.
CHANGING THE SP-175 Plus FOR USE
WITH INNERSHIELD FLUX CORED WIRE
• Change The Contact Tip
• Acquire Innershield Welding Kit (See ACCES-
SORIES section). Note: Feeding .035
” Innershield
requires nothing extra but feeding will be optimized
with the use of the KP666-035C drive roll.
1. Refer to Figure D.2. Remove the gas nozzle from
the gun by unscrewing counter-clockwise.
2. Remove the existing contact tip from the gun by
unscrewing counter-clockwise.
3. Insert and hand tighten the contact tip for use with
.035 ” or .045 ” (.045 ” requires a liner change also)
Innershield Flux Cored Wire.
4. Replace gas nozzle – The gasless nozzle may be
used instead of the gas nozzle to give improved
visibility of the arc.
CHANGING DRIVE ROLL
The drive roll, Figure D.1 Item 1, has two grooves; one
for .023"
– .025" (0.6mm) solid steel electrode and a larg-
er groove for .030" (0.8mm) solid and .035" (0.9mm) flux-
cored steel electrode. As shipped, the drive roll is
installed in the .023"
– .025" (0.6mm) position.
If .030"-.035" (0.9mm) wire is to be used, the drive roll
must be reversed as follows:
1. Turn the power switch to OFF (marked “ O ” ).
2. Release the spring-loaded idle arm tensioner, Figure D.1
Item 2, and lift the idle roll arm, Figure D.1 Item 3, away
from the drive roll.
3. Loosen the Phillips Head screw holding the drive
roll onto the drive shaft.
When inching the welding wire, the drive rolls,
gun connector block, and gun contact tip are
energized relative to work and ground and remain
energized for several seconds after the gun trig-
ger is released.
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4. Remove the drive roll, flip over and reinstall with the
opposite groove closest to the gearbox.
NOTE: The stencil of the groove that you want to use
is marked on the outside of the drive roll
(when installed)
5. Push a length of straightened welding wire through
the wire feeder guide tubes and reset the Phillips
Head screw to secure the drive roll onto the shaft.
6. Reapply the spring loaded idle arm tensioner.
7. Turn the power “ ON ” (I) and check the drive roll for
slipping when feeding wire. DO NOT OVERTIGHTEN -
If necessary, tighten or loosen the spring loaded
idle arm tensioner (2).
FIGURE D.1
CAUTION
3
2
1
SP-175 PLUS