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B-4

OPERATION

B-4

 

 

 

 

See Figure B.3

 

FIGURE B.3

8. WELDING GUN CONNECTOR BUSHING & THUMBSCREW – Provides electrical power to the welding gun. The thumbscrew holds the welding gun into the connector block. (Front of Machine, Side Door and Wire Drive Cover have been removed for clarity of Items 8 and 9).

9. OUTPUT TERMINALS These connections allow

8

for changing the output polarity of the machine

 

depending on whether you are MIG welding (+) or

 

flux-cored welding (-)-.

9

 

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See Figure B.4

10.WIRE SPOOL SPINDLE AND BRAKE – Holds a 4”(102mm) diameter spool. Use the 2”(51mm) spindle adapter included with the machine to use 8”(203mm) diameter spools. The wing nut sets the brake friction to prevent the spool from over rotat- ing when the trigger is released.

FIGURE B.4

2"(51mm) SPINDLE ADAPTER (FOR 8"(20mm) REEL OF WIRE)

( 4"(102mm) REEL OF WIRE)

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See Figure B.5

11.WIRE DRIVE & COMPONENTS (ALUMINUM DRIVE HOUSING) – Feeds wire from the wire spool through the drive and through the welding gun to the weld.

a.Top and Bottom Drive Roll – Drives the wire through the drive system. The drive roll has a groove to match the specific wire type and diam- eter. Refer to Table B.1 for available drive rolls.

b.Inner & Outer Wire Guide – Guides the wire between the Top and Bottom Drive Roll and through the wire drive. The inner guide has a groove to match a particular wire diameter. Refer to Table B.1 for available wire guides.

FIGURE B.5

TOP DRIVE ROLL PRESSURE ARM

TENSION ADJUSTOR DOWN

WIRE SPOOL

.035" (0.9mm)

NR-211-MP

INNER WIRE GUIDE REMOVED

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c. Drive Roll Tension Thumbscrew – Turning

clockwise increases the force on the drive rolls

LOWER DRIVE ROLL REMOVED

OUTER WIRE GUIDE REMOVED

and turning counterclockwise decreases the

 

force.

 

COMPACT WIRE WELDERS

Page 14
Image 14
Lincoln Electric SVM189-B service manual See Figure B.3, Drive Roll Tension Thumbscrew Turning