Lincoln Electric PRO 155 Operator's Manual page 35

D-3
CHANGING DRIVE ROLL
The drive roll has two knurled grooves; both for .035-
.045 (0.9-1.2 mm) flux-cored steel electrode.
If .023" – .025" (0.6 mm) wire is to be used, the drive
roll must be changed to a KP665-035 as follows:
1. Connect the machine to its rated input power per
instructions in Installation section.
2. Release the spring-loaded pressure arm and lift the
idle roll arm away from the drive roll.
3. Turn the power switch to ON (marked "I").
4. Set the wire speed to minimum and jog the drive
unit with the trigger switch until the drive roll set
screw is facing up.
CAUTION
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.
5. Turn the power switch to OFF (marked "O").
6. Loosen the drive roll set screw with the 5/64" (2.0
mm) hex wrench supplied.
7. Remove the drive roll and replace it with the
KP665-035 with the .023 – .025" (0.6 mm) groove
(the smaller groove) closest to the gearbox.
8. Push a length of straightened welding wire through
the wire feeder guide tubes and adjust the position
of the drive roll so that the groove is centered on
the wire. Make certain the set screw is located on
the flat portion of the shaft and tighten.
MAINTENANCE
3
1
PRO 155
FIGURE D.1
2
D-3