Snap-on Tools Corporation Kenosha, WI 53141-1410
7
WIRE FEED PRESSURE ROLL ADJUSTMENT
The wire feed pressure roll is
adjusted to the proper setting at
the factory, prior to delivery. It
may be necessary to readjust the
setting as components "seat in" or
when changing to a different diam-
eter wire. To check for proper roll
pressure, hold the torch in one hand
and the wire between two fingers of
the other hand. Pull the torch
trigger. If the wire continues to
feed when firm pressure is applied
to the wire, the pressure roll
adjusting nut should be backed off
until the feed rolls start to slip.
If the wire will not feed with very
little pressure applied, the pres-
sure roll adjusting nut should be
tightened.
12.Install the contact tip over the
protruding wire and tighten it
firmly using a proper size wrench.
Make sure the tip is the correct
size for the wire being used.
13.Install the nozzle on the torch.
For steel, the contact tip should
be flush or stick out up to 1/16
inch beyond the end of the
nozzle. For aluminum, the con-
tact tip should be recessed 1/8
to 3/8 inch inside the nozzle.
Using wire cutters, trim off the
wire so the stickout is approxi-
mately 1/4 inch for steel or 1
inch for aluminum. For aluminum,
the end of the wire should be
bent over so it does not JAM into
the work. This is called a
"scratch start". See Figure 9.
TORCH SELECTOR CABLE
Plug the torch selector cable
into the Positive (+) terminal on
the machine(see PROCESS SELECTION
on page 8 for further details).
WORK (GROUND) CABLE
Uncoil the Work cable and plug it
into the negative (-) terminal on
the machine.
FIGURE 10. PRESSURE ROLL ADJUSTMENT
14.For steel welding only, spray
anti-spatter compound inside the
nozzle and on the outside of the
contact tip. For aluminum or
stainless steel welding, NO anti-
spatter compound can be used as
it will contaminate the weld.
FIG. 9. WIRE STICKOUT - STEEL, ALUMINUM
1/4"
STICK-
OUT
1"
STICK-OUT
FOR STEEL:
CONTACT TIP
FOR ALUMINUM:
FLUSH WITH NOZZLE
TIP RECESSED 1/8" - 3/8"
PRESSURE ROLL
PRESSURE
ADJUSTING NUT
ROLL
PRESSURE
ROLL ARM
DRIVE
ROLL
