Lincoln Electric IM790 manual Friction Brake Adjustments, Wire Threading

B-4	OPERATION		B-4
	FIGURE B.3	FIGURE B.4

Wire Spindle Shaft 4" Wire Spool

Wing Nut

and Spacer

To wire drive

Note: The brake should be adjusted with a spool of wire installed. When properly adjusted it should move freely but not coast.

Friction Brake Adjustments

1.With wire spool installed, check free movement and coast of the spool.

2.To tighten the brake, turn the wing nut clockwise in 1/4 turn increments until coasting stops.

3.To loosen the brake, turn the wing nut counter- clockwise in 1/4 turn increments until the wire spool moves freely without coasting.

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 incoming guide tube (4), over the drive roll (3), and into the out-going guide tube (5).

5.Close the idle roll arm and latch the spring loaded pressure arm (2) in place (now you may release the welding wire).

2

	1
5	4
3	The Wire Drive Feed Roll can
	accommodate two wire sizes by
	flipping the wire drive feed roll
	over. The sizes are stenciled on
	the drive roll.

6.The idle roll pressure adjustment wing nut is nor- mally set for mid-position on the pressure arm threads. If feeding problems occur because the wire is flattened excessively, turn the pressure adjustment 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 (unscrew) gas noz- zle and contact tip from end of gun.

8.Turn the SP-175 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.

11.Replace contact tip and gas nozzle.

12.Refer to Figure B-6. Cut the wire off 3/8” – 1/2” (10 – 13 mm) from the end of the tip. The SP-175 Plus is now ready to weld.

SP-175 PLUS