Verify Drive Rolls; Change Upper Drive Roll; Figure 22 - Lower Drive Roll; Figure 23 - Tension Knob - Lincoln Electric HELIX T55 Operator's Manual

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Verify Drive Rolls

Before installing wire, verify that the proper drive
rolls are installed in each of the wire feed units. To
check drive roller sizes, remove the cover plate
from the front of the wire feed unit with a 9/64" hex
key (see Figure 20 – Roller Setup). The wire diame-
ter is stamped on the side of the lower drive roll.
The standard drive roll, KP52079-35 is for 0.035"
wire. Visually verify that the groove size is the
same for the upper and lower drive rolls. There are
2 drive rolls per wire arm assembly.
There are larger diameter drive rolls
available: KP52079-45 for 0.045" wire,
and KP52079-52 for 0.052 wire.
FIGURE 22 – LOWER DRIVE ROLL

Change Upper Drive Roll

If the sizes are not the same, or to change the drive
rolls, start by loosening the tension knob (see Fig-
ure – 21 Tension Knob) until the upper roll can pivot
away.
FIGURE 23 – TENSION KNOB
INSTALLATION
With the tension knob loose the upper drive roll can
rotate freely. Rotate the drive roll until the set
screw (see Figure 22 – Set Screw) is exposed and
loosen with a .050" hex key.
FIGURE 24 – SET SCREW
With the set screw loose slide the shaft out releas-
ing the upper drive roll. There is an access hole on
the back of the wire feed where you can insert the
"
7/64 hex key to push the shaft out (see Figure 23 –
Drive Roll Shaft).
FIGURE 25 – DRIVE ROLL SHAFT
Remove the upper drive roll from the assembly.
Insert the desired drive roll back into the slot and
insert the shaft through the bearings and drive roll-
er. The shaft is notched to provide a seat for the
set screw. Be sure to insert the shaft so that the
notch meets up with the set screw.
Tighten set screw on upper drive roll.
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