Lincoln-electric SP-135 PLUS IM725 User Manual download pdf (Page 17)

B-4B-4

OPERATION

FIGURE B.3

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).

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.

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.

FIGURE B.4

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.

WARNING

Wire Spindle Shaft

4" Wire Spool

Wing Nut

and Spacer

To wire drive

SP-135 PLUS

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 47 48

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Lincoln-electric SP-135 PLUS IM725 User Manual Page 17

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