AA-12

INSTALLATION

AA-12

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ASSEMBLY OF DRIVE ROLLS AND WIRE GUIDES

WARNING

ELECTRIC SHOCK can kill.

Turn the input power OFF at the welding power source before instal- lation or changing drive rolls and/or guides.

Do not touch electrically live parts.

When inching with the gun trigger, electrode and drive mechanism are "hot" to work and ground and could remain energized several seconds after the gun trigger is released.

Only qualified personnel should perform mainte- nance work.

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To remove drive rolls and wire guides: (See Figure AA.6)

1.Turn power off at the welding power source.

2.Remove the outer wire guide.

3.Rotate 4 triangular rings to the unlocked position.

4.Open the pressure arms.

5.Remove the drive rolls and inner wire guide.

FIGURE AA.6

2 PRESSURE ARMS ROTATE DOWN

4 TRIANGULAR RINGS IN UNLOCKED POSITION

OUTER WIRE GUIDE

To install drive rolls and wire guides: (See Figure AA.7 and AA.7a)

1.Turn off power at the welding power source.

2.Open pressure arms.

3.Assemble the inner wire guide.

4.Slide the drive rolls onto the drive hubs. (See figure AA.7)

5.Close the pressure arms.

6.Rotate 4 triangular rings to the locked position. (See figure AA.7a)

7.Assemble the outer wire guide.

8.Adjust the pressure arms to the recommended set- ting.

FIGURE AA.7

DRIVE HUBS

PRESSURE ARMS

IN OPEN POSITION

INNER WIRE GUIDE

DRIVE ROLLS

FIGURE AA.7a

SLIDE DRIVE ROLL

ON DRIVE HUB

TRIANGULAR RING IN

UNLOCKED POSITION

TRIANGULAR RING IN

LOCKED POSITION

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LF-72/74

Page 54
Image 54
Lincoln Electric LF-72/74 service manual Assembly of Drive Rolls and Wire Guides, AA-12