Lincoln Electric SP-135 PLUS IM725 Operator's Manual page 17

B-4
FIGURE B.3
Wire Spindle Shaft
To wire drive
Friction Brake Adjustment
With wire spool installed on the spindle shaft and the
wing nut loose, turn the spool by hand while slowly
tightening the wing nut until a light drag is felt. Tighten
the wing nut an additional 1/4 turn.
Note: When properly adjusted, the brake should pro-
vide only enough drag to prevent overrun of the spool
and excess slack in the wire. Too much drag may
result in wire feeding problems, and may cause pre-
mature wear of wire drive system components.
Wire Threading
Refer to Figure B.4
1. Release the Spring Loaded Pressure Arm (1)
rotate the Idle Roll Arm (2) away from the Wire
Feed Drive Roll (3). Ensure that the visible, sten-
ciled size on the drive roll matches the wire size
being used.
2. Carefully detach the end of the wire from the
spool. To prevent the spool from unwinding, do
not release the wire until after step 5.
3. Cut the bent portion of wire off and straighten the
first 4" (100 mm).
4. Thread the wire through the In-going guide tube
(4), over the drive roll (3), and into the out-going
guide tube (5).
5. Close the idle roll arm (2) and latch the spring
loaded pressure arm (1) in place (now you may
release the welding wire).
OPERATION
4" Wire Spool
Wing Nut
and Spacer
FIGURE B.4
2
4
5
3
6. The idle roll pressure adjustment wing nut is factory
set to approximately five full turns from where the
wing nut first engages the threads of the pressure
arm (1). If feeding problems occur because the wire
is flattened excessively, turn the pressure adjust-
ment counter-clockwise to reduce distortion of the
wire. Slightly less pressure may be required when
using 0.023 – 0.025" (0,6 mm) wire. If the drive roll
slips while feeding wire, the pressure should be
increased until the wire feeds properly.
WARNING
When inching the welding wire, the drive rolls, the
gun connector block and the gun contact tip are
always energized relative to work and ground and
remain energized several seconds after the gun
trigger is released.
7. Refer to Figure B.5. Remove gas nozzle and con-
tact tip from end of gun.
8. Turn the SP-135 PLUS ON ("I").
9. Straighten the gun cable assembly.
10. Depress the gun trigger switch and feed welding
wire through the gun and cable. (Point gun away
from yourself and others while feeding wire.)
Release gun trigger after wire appears at end of
gun.
Note: If the wire will not feed smoothly, or if the wire
feed motor shuts off unexpectedly, see the
"FEEDING PROBLEMS" section of the "TROU-
BLESHOOTING GUIDE" in this manual.
11. Replace contact tip and gas nozzle.
12. Refer to Figure B-6. Cut the wire off 1/4" – 3/8"
(6 – 10 mm) from the end of the tip. The SP-135
PLUS is now ready to weld.
SP-135 PLUS
B-4
1
The Wire Drive Feed
Roll can accommodate
two wire sizes by flipping
the wire drive feed roll
over. The sizes are sten-
ciled on the drive roll.