Component Replacement Procedures - Lincoln Electric WELDMARK 135 PLUS IM789 Operator's Manual

D-3
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 WELDMARK 135 PLUS
FOR USE WITH INNERSHIELD FLUX
CORED WIRE
• Change The Contact Tip
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
0.035" Innershield Flux Cored Wire.
4. Replace gas nozzle – The gasless nozzle may be
used instead of the gas nozzle to give improved visi-
bility of the arc.
CHANGING DRIVE ROLL
The drive roll, Figure D.1 Item 1, has two grooves; one
for .023" – .025" (0.6 mm) solid steel electrode and a
larger groove for .030" (0.8 mm) solid and .035" (0.9 mm)
flux-cored steel electrode. As shipped, the drive roll is
installed in the .023"-.025" (0.6 mm) position.
If .030"/.035" (0.8/0.9 mm) 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.
MAINTENANCE
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.
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 unit
(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).
3
WELDMARK 135 PLUS
CAUTION
2
1
FIGURE D.1
D-3