Lincoln Electric LF 52D Operator's Manual page 37

Adjusting of Pressure Roll Force
The pressure arm controls the amount of force the drive
rolls exert on the wire. Pressure force is adjusted by
turning the adjustment nut clockwise to increase force,
counterclockwise to decrease force. Proper adjustment of
pressure arm gives the best welding performance.
WARNING
If the roll pressure is too weak the roll will slide on the
wire. If the roll pressure is set too heavy the wire may be
deformed, which cause feeding problems in the welding.
The pressure force should be set properly. For this
purpose decrease the pressure force slowly until the wire
just begins to slide on the drive roll and then increase the
force slightly by turning of the adjustment nut by one turn.
Inserting Electrode Wire into Welding
Torch

Turn the welding machine off.

Depending of welding process connect proper welding
torch to the euro socket. Rated parameters of the
torch and welding machine should be matched.

Depends on type of gun must be remove the nozzle
from the gun and contact tip or protection cap and
contact tip.

Turn the welding machine on.

Hold the Cold Feed/Gas Purge Switch [14] or use
torch trigger until wire appear over threaded end of the
gun.

When the Cold Feed switch or torch trigger is released
spool of wire should not unwind.

Adjust wire spool brake accordingly.

Turn the welding machine off.

Install a proper contact tip.

Depending on the welding process and the type of the
gun, install the nozzle (GMAW process) or protection
cap (FCAW process).
WARNING
Take precaution to keep eyes and hands away from the
end of the gun while the wire is being come out of the
threaded end.
English
Changing Driving Rolls
Turn the input power off before installation or changing
drive rolls.
Wire Feeders LF 52D i LF 56D are equipped with drive
roll V1.0/V1.2 for steel wire. For others wires and sizes it
is required to install proper drive rolls kit (see
"Accessories" chapter) and follow instruction:

Turn the input power OFF.

Unlock 4 rolls by turning 4 Quick-Change Carrier Gear
[49].

Release the pressure roll levers [50].

Change the drive rolls [48] corresponding to the used
wire.
Be sure that the gun liner and contact tip are also size to
match the selected wire size.
For wires with the diameter larger than 1.6mm, the
following parts have to be changed:

The guide tube of the feeding console [46] and [47].

The guide tube of the Euro Socket [45].

Lock 4 new rolls by turning 4 Quick-Change Carrier
Gear [49].

Insert the wire through the guide tube, over the roller
and through the guide tube of Euro Socket into liner of
gun. The wire can be pushed into the liner manually
for a few centimeters, and should feed easily and
without any force.

Lock the pressure roll levers [50].
35
WARNING
WARNING
WARNING
Figure 73
English