Lincoln Electric IM725 manual 4OPERATIONB-4

B-4OPERATIONB-4

FIGURE B.3 FIGURE B.4

Wire Spindle Shaft

4" Wire Spool

	Wing Nut
To wire drive	and Spacer

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.

2

5	1
	4
3	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.

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.

Wire Threading		WARNING
Refer to Figure B.4	When inching the welding wire, the drive rolls, the
1. Release the Spring Loaded Pressure Arm (1)	gun connector block and the gun contact tip are
	always energized relative to work and ground and
rotate the Idle Roll Arm (2) away from the Wire	remain energized several seconds after the gun
Feed Drive Roll (3). Ensure that the visible, sten-	trigger is released.
ciled size on the drive roll matches the wire size
being used.	7.	Refer to Figure B.5. Remove gas nozzle and con-
2. Carefully detach the end of the wire from the		tact tip from end of gun.
spool. To prevent the spool from unwinding, do	8.	Turn the SP-135 PLUS ON (“I”).
not release the wire until after step 5.	9.	Straighten the gun cable assembly.
3. Cut the bent portion of wire off and straighten the
first 4” (100 mm).	10. Depress the gun trigger switch and feed welding
4. Thread the wire through the In-going guide tube		wire through the gun and cable. (Point gun away
		from yourself and others while feeding wire.)
(4), over the drive roll (3), and into the out-going		Release gun trigger after wire appears at end of
guide tube (5).		gun.
5. Close the idle roll arm (2) and latch the spring	Note: If the wire will not feed smoothly, or if the wire
loaded pressure arm (1) in place (now you may		feed motor shuts off unexpectedly, see the
release the welding wire).		"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